Use Steam's built-in voice settings and disable Push-to-Talk in Worms, ex:
http://www.shackpics.com/files/SteamWormsVoiceConfig_wv5di68koezaity58xrn.png

*OR* Use TS3 if you can't figure any of it out. It's not necessary though if you set steam and the game up correctly once. Well twice after the patch ♥♥♥♥♥♥ it. And probably a third time if they patch it again. Good gravy!