what you do is
once you're on the part where you would normally move the joypad to either home or away team. Keep pressing L1 all the way as far as you can until the the word "fix" comes onto the screen. Once you can see Fix on the screen press the Square button......this then brings up the screen with the list of your players names. It will have P1..or whatever. Next to the player you are currently controlling. Go to that player, in your case, it sounds like it's Eto'o. Once you have highlighted that player, click x, then go to the player who you would like to control, and click x again on them. P1 should then move from Eto'o to whoever it is you have selected.
Thats all.