You will sent to the "Manage Connections" page.  Your family member will appear.  Please select the appropriate relation (ex. Husband, Wife, Brother, etc) and a blue box will appear.  You may type in a comment.  Then click on the "Update" button. 

You will see in the upper left-hand corner, "Your connects are successfully updated!" 

After a moment the screen will blink and then you're done.  Now, if someone click's on Young's profile and clicks the "Family" tab on the bottom, your profile picture will be displayed. 

If someone clicks your profile and the Family tab at the bottom, Young will be shown as a family member, and people can further see he is my uncle by hovering the mouse over the photo.  If you have made a mistake, you can click the red "X" in the upper right hand corner and break the family connection.