How can I invite people to be my friend within the App?

Go to the Friends section, tap on the ‘+’ button and follow the prompts.  You can either invite contacts from your phone, your Facebook friends, or else you can send an email which will include a link.

Alternatively you can also tap on the ‘Share’ button found in the top right corner of ‘Add Friends’ - this will open functionality within the App that enables you to see alternative ways to send your friends a link.

When you are in a Friends Challenge with participants who aren’t your friend yet, you can also tap on their profile picture and invite them to be your friend.