Question bout online gamin

Im new to the online gaming and wanted to know what do i need or how do i go about sending messages,i always get them but dont know how to respond.Also how do you have a rematch?thanks in advance

you in ps3 or 360

PS3

you press the PS button, then go to ur friends list all the way to the right, then click messages and you can reply from there. or you can create a message.

you can also go to your recently met list to find people that youve played and press triangle over there name to send them a message.

thanks a mill,im finna see if i can text now