This guide will take you step-by-step through setting up push-to-talk on your Teamspeak. This is useful for when your background noise is causing mic spam. We generally request that you have this enabled regardless, however some can get away with voice detection if their background doesn't cause disturbances.
If like me you are using a smaller window for TeamSpeak, you may need to also click the little Double Arrow button to reveal the Settings menu.
Alternatively you can use the keyboard shortcut of Alt + P to launch the window.
Ensure that 'Push-To-Talk' is selected (and not Continuous or Voice Activated) and then click the button (highlighted in blue in our screenshot) to bring up a gray box. While this box is open, press a key combination (This could be a single button such as Ctrl or two such as Ctrl+T) to use as your Push-To-Talk Button.