I don't seem to have a "Look and Layout" item.
There are two ways that your profile page may be laid out. When you chose "Profile" from the main menu you can either ...
Just below the menu, and the breadcrumb that defines where you are, there is a blue bar across the page with the word "Summary" in it. On the far right hand side, just above the blue bar are two left pointing arrows (triangles actually). clicking on those changes to the alternate layout in which ...
There is a menu bar down the left hand side of the page with "Profile Info" in its heading, and the summary heading has moved to the right a short way. Profile Info has two right pointing arrows/triangles which you can clck to go back to the previous layout.
In the first arrangement there is a sub menu above "Summary" with "Modify Profile" in it. Hover over that and an additional menu drops down from it with "Look and Layout" in it.
In the second arrangement, "Modify Profile" is one of the blue headings down the left hand side, with "Look and Layout" one of the items under that