There are a total of 6 ranks for each power that you have. Each rank costs as many points = to the value of rank. Rank 1 costs 1 point, Rank 2 costs 2 points, etc. Therefore, you will need a total of 21 points to rank a power up completely. You should be able to get this easily while playing through the game. To get to this menu, press
and go to "Squad." Highlight the power of choice and press
. Now you will be put into a menu with the stats of the powers and what each upgrade will do for you. If you mess up, you can press
to undo the upgrade. Be aware, if you leave the menu after upgrading, you will no longer have the undo option.
Imported Character: If you imported your character and beat Mass Effect 2, likely you will be a level 30 already and have points to spend. As soon as you can move you may upgrade and get to rank 6 on a power if it's close. This could very well be your first achievement.