If you’d like to post something on a friend’s timeline, it’s simple.
First search for your friend, then tap to select them.
From here tap Write Post.
You can include a photo, location, or tag friends.
When you’re finished tap Post.
Remember, anything you post on a friend's Timeline will be visible to your friends and
your friend's friends.
If you'd prefer to share something privately with a friend, you can send them a private
message instead.