Go into your game just like you are going to play the turn (where you see all your Forts and stuff).
On the top right you will see a list and one of them says OPTIONS, click on that and you will see at the top a selection that says "Become Computer Controlled". just hit that heading and it will ask you if you are sure, click yes (or OK or what ever it wants) and your are now AI.
I want to thank you for playing and hoped you enjoyed yourself and also learned 1 thing new.
