how do I pick the players for the match

anybody knows how to select the players for the team.
how are the Man of The Matches selected? Media official RBS MOM was Ben Youngs
no like. on my team roster I have so many players but when I want to select subs during a match only a partial of my team is selected. how do I pick who will be my subs for the match?
i would like to know the answer to this as well
Micky Plain Mick :

i would like to know the answer to this as well

Open your Strategy bldg during a game. Available subs are on the left and you just drag them into position, 7 allowed per game.
That's easy anyone listed as 1-15 is in your starting squad the rest are bench or subs whatever you wanna call em
Or even "finishers" in the latest parlance!