The categories are sorted in an organized tree structure. Each category's parent is on top, named by the collection's name (in the example "Magyar Pénzek" ("Hungarian coin"), and cannot be renamed). The user's own categories can be incorporated below it. This collection consists of both medieval House of Árpád coins and modern Forints among others. Both are Hungarian coins, so both parents is the "Magyar Pénzek" ("Hungarian coin") category. Between these two categories there are no ordering relationship, and therefore appear directly below each other. The Forint collection in turn is further divided into subcategories. The location of categories, that is, their indent, or aligned position, indicate their relation to each other. A little gray pointing to right triangle in front of a category indicates that the category includes additional sub-categories. The opened category - under which the subcategories are visible - is indicated by a pointing down black triangle.
Important to note, that the central list window displays all of the coins that are in the selected category, regardless of whether they are in a sub-category. In the above example, in the center the entire Forint collection is listed, the 1946 two Filler as well as an 2012 ten Forint. If the user only wants to see coins between years 1946-1949, then he clicks on the category "II. Magyar Köztársaság (1946-1949)" ("2nd Republic of Hungary (1946-1949)").
Let's suppose that for the existing Hungarian coin collection the user purchased a silver denarius of King Matthias (Mátyás). How can he insert it into the catalogue? To the existing categories not at all, he must create a new one. The new piece is a Hungarian coin, but neither of House of Árpád nor modern Forint therefore he needs to insert a new category just below the "Hungarian coins". It is therefore important that before the user clicks the 
, makes it sure that the parent category "Hungarian coins" is selected in the list. (In this example framed in blue).
Click on the newly applied "Mixed houses of Kings" category. As it can be seen the 
button is enabled. The newly applied category could even be deleted, if better name was found in the meantime. Generally speaking, each category may be deleted, that does not include neither any subcategories nor any medals. In other words, if the user wants to delete a category, he must first delete coins from it, or move the coins to other categories from it. If it contains subcategories, that should be also deleted, or assigned to a different category. This simple procedure is described in the "Ordering" menu.
If everything went well, the categories "Mixed houses of Kings" ("Vegyesházi királyok") and "Matthias" are available to categorize new coins.
If the user changes his mind and wants to rename category" Matthias" to "Matthias Corvinus", then clicks once on the name of Matthias. Then the frame around the name changes to empty rectangle, and indicates the possibility to rewrite the content. After the name has been changed press the ENTER.
The order of categories is fixed and can only be changed if the user wants. If the user wants to exchange the order, he can "grab" the category and drag it, that is, press down the left mouse button above the category's name, but do not release the button. "Drag" category with the mouse to a new location. If in this example, he wants to put "Peter Orseolo second kingdom" ("Orseolo Péter 2. királyságát") directly after "Peter Orseolo" then move the mouse to "Aba Samuel", not over the name, but between the two names. (A black frame is displayed when the mouse is over a name, and a horizontal black line when the mouse is between the name.) 
This could hardly been a goal, but a good example of how a category can be moved under a different category in a single movement. Moving the categories requires a lot of attention, so before the "OK" button is pressed, check it twice that the appropriate action was actually carried out. If in doubt, do not press the "OK" button, but close the dialog box with the top right general window closing button 
. In this case, the user is prompted to "Are you sure to quit without saving? Your ordering so far will be lost". Of course, the user can also save the sort in its present state, because at any moment, and as often as he wants he can re-arrange the categories.
or 
buttons.
Entering to the download page the user will find a list of downloadable categories. It may be several pages long, so it is possible to narrow down the selection. As it was described at the category uploading four characteristics can be selected from their lists to ensure fewer items to be displayed, making it easy selection. If the list still would cover more than one page, the "Next" and "Previous" buttons can help the user to navigate through the pages. Click on the category to view its details, description and uploading time. If the user is satisfied with the category for his purpose, he pushed the download button and the category will be imported.