Users can use their User Page to give information about themselves. People are free to make them as they like, as long as it remain appropriate.
Copy the code below when editing your userpage in Source mode.
Than you can switch to the visual mode and click the green puzzle piece.
Then, click the edit button (see in the picture above if you can't locate it) and fill in the form. After finishing click "Ok" and save the changes you made to the User Page.