To create a custom challenge for your team to complete:
Go to the messaging tab (bottom second from right)
Press Team Challenges
Click the '+' icon in the top right corner
Select 'Add a Custom Challenge'
Select a Badge, add a title, description, set the number of recurrences, video URL, who can verify if the challenge is complete and click 'Add'.
Once the challenges is added, each member of the team will receive a notification to complete the challenge. Once they have completed the challenge, they can simply mark it complete with a check mark.