You can edit the recipient’s nickname, his/her first and last name, his/her postal address and the journal's language. You can also add a profile picture if you wish.
On the mobile app, edit the recipient’s profile in the “...’s profile” section. On a computer, click on “...’s network” in the top right corner and then on “...’s profile”.
You will find details on how to edit the recipient's address here.