First, you'll need to have a 13+ Roblox account.
You must then go into your account settings
to verify your age.
To do this, click the gear icon
in the top right corner of the page.
For this step, you will need a valid ID
and a smartphone.
Roblox accepts driver's licenses,
passports, ID cards, and residence permits
as valid identification.
This process usually takes a few minutes.
If your verification completes successfully,
a check mark will show up,
along with age verified on your settings menu.
After you successfully verify your identity,
navigate over to the privacy tab
in your account settings.
Here you'll find a toggle box
that will enable voice chat in games.
Click the toggle box to green,
and you'll be ready to use this feature.
To make use of voice chat,
click play on any game that supports voice chat.
When you join a game,
your microphone will be muted automatically.
To start chatting, simply click on the microphone icon
above your head.
If you would like to mute anyone in the game,
go over to the escape menu
and click the microphone icon next to their name.
You can also opt to mute everyone in the server
by clicking "Mute All."