You don't need to be in a section of seats designated for the Red Patch Boys or Innebriatti or any of the supporters groups to join in. If you got tickets to the game and asked to be in a supporters area for Toronto (make sure you say you're a Toronto supporter!) you will be in an area of the stadium in the thick of Toronto support. Then, just do the following:
Look: Watch the game. This is going to be charged.
Listen: You'll definitely be close enough to hear the singing and what is being sung
Loud: Sing along! If you can't quite pick it up, ask the guy next to you. If they don't know, get that guy to ask the guy next to him. Make new friends and be involved. This has the potential to be more than just an incredible game in the history of TFC. An away game support is special. It can change you.
RPB, General Supporters Section, it won't matter. It will be one huge section. One giant group of Toronto supporters. We will all be there for TFC together, so fear not. The biggest hurdle is getting yourself to the Big O on the 22nd.