I recently made the switch from the Xbox 360 to the PS3, and lucky enough for me, my brand new system came with a 30 day free trial to Playstation Plus!
My question is : How can I change my Playstation Plus from automatically changing to a 3 months subscription into a 1 year subscription?
If you buy a 1 year subscription before your trial expires, then the automatic renewal will happen in a year, and will be for anoher 1 year. Automatic subscription renewal only happens if you don't purchase another subscription before the current one expires. However, trial subscriptions don't stack. Your new subscription will start immediately, so you should wait until the trial is almost over if you want to minimize the free days lost.