When you go to the tab with the "Profile Editor" you see all the profiles as a list in the middle of the screen showing two columns ("Version name" and "Version")
When double klicking on one of those you can edit that specific profile. However there are some odd behavour here:
If you select a profile in that list, the selected profile in the dropdown list down in the lower left corner does not change.
This also means that if you press "Edit profile" instead of double klicking after selecting one in the top list, you wont get the list you tried to select, but the one previously selected in the dropdown list (down left).
Also If you press enter instead of double klicking when you have an item selected in the list it behaves as the tab key and you switch to the next profile in the list instead of entering editing mode as you would expect.

(On a bit of a sidenote: In general the UI is quite hard to navigate only using your keyboard.)