Step One: Log in to the Facebook home page. If you haven't registered yet, select "Register" to get started. Step Two: Go to the "My Photos" page. You will notice that photos that have recently been tagged with your friends' name appear on this page. Step Three: View a photo album by clicking on the album cover or the "View" link. Step Four:Choose an image to tag by clicking on the photo's thumbnail. It will enlarge after you click on it. Step Five: Select the "Tag This Photo" link. When you mouse over the photo, the cursor should become a crosshair.