Board Thread:General Discussion/@comment-26257239-20150419194332/@comment-24739965-20150419200314

For the first question, muting voice chat will just mute all voice chat on your screen, not the entire room. You will just not hear them during gameplay, but they'll still communicate with others.

To answer your second question. Use the Directional Button Pad. Up and down buttons change the message to send. Right will send the message, pressing it will send it to the team, while holding it down will send it to all players.