1. On any page, go to 'Settings' in the right-hand corner and choose 'Forum configuration'.
2. Click on your forum's name.
3. From the menu on the left-hand side choose 'Beta testers'
4. Paste your beta testers' email addresses in the field provided. You can also write your own welcome message.
5. Click 'Send'.
6. Congratulations - you've successfully invited new beta testers.