Before, you can start using Groovy, you must first invite him to your server.
- Click this link.
- Select your server *
- Press "Authorize"
- Complete the captcha
* If you did not see your server in the menu, then you do not have the Manage Server permission in the the server you are attempting to invite Groovy to. If you are sure you do have sufficient permissions, then you are signed into the wrong account in your browser.
Now, you are ready to use Groovy. Simply join a voice channel and tell him to play a song!
The same command works with URLs and playlists.