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@Elizaore If you've accepted a friend request, you should see your friend show up on your 7-day friend rankings and be able to send messages and participate in Challenges with each other.
If this is not the case for some reason, I'd recommend double checking both your privacy settings and that you've both selected "Show Me" for the Friend Rankings Section in your Personal Information.
Click here for a more in-depth look of how friends work on Fitbit.