View your score (Should be ) by default). On the second tab, it tells you how many ‘skill’ points (they’re actually for stats) you have available, and how much experience you have, and how much you need for the next ‘level’, ie next point.
You need to actually spend those points to increase your stats. You do that on the character screen (default @) by just going to the stat you want to increase and hitting enter, it will ask you if you want to spend your point to increase the stat.