1.) First you need to create a player
2.) Earn some EXP points and spend on your skills in Career, Online or Tournament mode.
3.) Enter to the "Player Area" menu
4.) Choose the "Player Evolution" option.
5.) Select a skill by highlighting any skill option and pressing X.
6.) Spend your EXP points and press X.
7.) Now press X again and remove the experience points you just spent.
8.) Now press Circle.
9.) The selected skill will still have the points you spent, but they can now be used again.
10.) Repeat the process to max out all skills of your player.