You can set your Facebook profile to display your current relationship status, and you can also specify whom you are in a relationship with and add a link to their profile on yours. To designate someone as your partner on Facebook, you must send that person a relationship request. Relationship requests help to prevent people from editing their profile to say they are in a relationship with somebody that they are not actually in a relationship with.
Log in to your Facebook account at Facebook.com.
Click the "Edit my Profile" link underneath your name in the upper-left corner of your News Feed page.
Click "Featured People" to edit information about your relationship.
Set the "Relationship Status" drop-down box to the option that best matches your current relationship situation.
Type the name of the person you are in a relationship with in the text field under the "Relationship Status" drop-down box.
Click "Save Changes."
You cannot send a relationship request if your relationship status is set to single, widowed, separated or divorced.
You must be friends with a person on Facebook to send a relationship request to that person.
Facebook does not allow you to link relationships to multiple people at the same time.