Make sure your headset is plugged in and that Google Chrome is accessing the right microphone (i.e. USB vs. built in mic) on your computer: Open Google Chrome settings and click on "show advanced settings" at the bottom.
At the bottom of the page you will see the " Privacy" section in here you can click on "Content settings".
Under "Media" section choose the microphone device that you will be using. After this click "Done" and Chrome will use the selected mic as default.
If after these steps you still have problems with your microphone there are other options that could need setup.
1. Verify that you are not giving exclusive microphone access to another application like Skype: Unplug your headset from your computer. Quit Skype and close Ricochet. Plug your headset back into your computer. Open Ricochet and login. If this solves the problem, and you are using Windows, you must adjust your computer settings to prevent this from happening again.
2.Access your sound settings from your control panel. The location of this setting varies depending on your Windows version: Open your “Control panel. Then click on “Hardware and Sound”.
Then click on “Sound”. In the new opened window click on the “Recording” tab and then select your microphone (i.e. “Headset mic”, “Internal mic”, etc.) and click "Properties".
Click the "Advanced" tab. Check mark in the box next to "Allow applications to take exclusive control of this device". Then click "Apply". Make sure that the "Give exclusive mode applications priority" check is unmarked.