The margin sets usually look like metal brackets at the very top of the typewriter. They may have a button you have to press before you can move them.
[header] How to use a manual typewriter [title] Slide the margin set on the right-hand side of the typewriter. [step] Before you start typing, you'll want to make sure that your margins are set correctly. The right-hand margin set is usually located next to the larger carriage release lever at the top right of the typewriter.