Because a lot of people seems to have trouble with how to do this (and you really should do it), I have made a short tutorial video on how to set your Push To Talk (PTT) settings in Discord. By doing this, you avoid transmitting in voice rooms unintentionally, and thereby disturbing others in the room.

The bonus is that if you have Discord backgrounded while you're doing other things, and someone calls to you in a voice room, you can reply by simply hitting your PTT key, all without having to click away from another application you are using. The ultimate convenience.

Watch this short video howto