easiest way to enable voice chat in roblox?

once it's on, you usually join a game with your mic muted. click the little mic icon above your avatar's head (or next to the menu button) to unmute. if there's no mic icon at all, that game just doesn't have voice switched on.

You have to verify your age first, it's 13+ only. Somewhere under Settings > Account Info there's a verify age option, either an ID or the face scan thing on the phone app. Once that goes through, the voice chat toggle shows up under Privacy. Two things people miss: the game itself has to have voice turned on (loads don't), and the app needs mic permission on your device.