you can't add friends in repl.it

You can't add a friend. on repl.it but you sure can invite someone to your team. Just go to the Teams tab on the left and invite the person you want to a free team:

There, you and your friend can chat... (considering you have one.)

I don't think you can add friends, but it is fairly easy to make friends! Most people on here are polite and easy to talk to!