By following the below steps:
- Create your team and join a public or private contest
- Tap on 'Share this contest with your friends'
- Click on 'Share to a Group'
- Select the group/ groups of your choice, tap 'Send' on the top right-hand corner, and that's it.
In case you missed sharing a contest while joining it, head to My Matches > My Contests and you'll see the 'Share this contest with your friends' option here as well. Now that you've challenged your friends, ready, get set, compete!
PS: You won't be able to share a contest once it gets full. So, hurry!