Came back after a long time off

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Hello all, I have been on MFP (free version) for a long time but only last year subscribed and am enjoying the benefits of the paid version. I really like it. But I'm confused. I can't seem to figure out how to add people or how to have others see my diet and give me tips. can someone walk me through how one 'adds' friends. I don't see quite how the program works. thanks.