First thing is you will want to verify that indeed the databases have been created. The databases should be stored in the xlobby/database directory. Make sure the .xml files are there for the consoles (SNES, MAME, etc.) that you have ROMs for.
Then in xlobby:
-goto the skin editor (pause/break key), and click on the "Screen" tab.
-Under the "Add" tab (default for when you click on the "Screen" tab), where the catagory window is, add a catagory name, we'll call it gameroms, but you can name it whatever you want.
-click on Add
-a box should now be present in the skin screen. Select that box.
-click on the "Item" tab, then the "Catagory" tab, then the "Database" tab. Select the ROMs database that you want to show.
To give a quick run down of how to display it properly:
The "General" tab will give you the columns/row, catagory name etc.
The "Layout" tab will set up coverart display and where to place titles etc.
The "Database" tab, as mentioned above, selects the database to use with this catagory
The "Scroll" tab, is used to setup how to scroll through the different datbase enteries
The "Display" tab will setup images for selection/item highlight, offline images, etc.
The "Events" tab will allow you to set an event of command to run when selecting the database item.
Now if you have multiple databases, you can then create different screens, each with its own cat/database, or you can use the "catagory:set database" command (F2 Setup:Events) to associate different databases to a single catagory, then associate that event to a button...but that's another lesson for another day
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Now have fun and experiment.