Simply by following the below steps. 😀
1️⃣ Create your team and join a public or private contest
2️⃣ Tap on 'Share this contest with your friends'
3️⃣ Click on 'Share to a Group'
4️⃣ Select the group/ groups of your choice, tap 'Send' on the top hand right corner and that's it.
👉 Missed sharing the contest with the group while joining? No worries! You can still share it on your groups. Head to 'My Contests' from the 'My Match' section in the app and follow all the steps mentioned above.
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!