You need to max them out so they are fully green, when you click on them they will increase a level. So Level 5 = 500, Level 6 = 600 ect ect :3 Good luck and happy studying
Looks like I need to do some more with my UI guide....
There's a couple of good intro videos that are posted on the Paradox Plaza forums in this thread. (Think some of those are listed here, too, but had that link handy.) Some of the info in the videos is outdated, so double check with the wiki (also listed in that post).
I am a moderator. I moderate stuff. When I do, I write in this color.
JohnCarver wrote:anybody who argues to remove a mechanic that allows "yet another" way to summon somebody is really a carebear in disguise trying to save his own hide.