How to Mark Up a Word Document

Open the Word document. You can double-click the document's name to open it in Word. Alternatively, open Word (it's in the Windows menu on a PC and the Applications folder on a Mac), click File, click Open, then select the document.

Click the Review tab. It's at the top of the screen.

Click Track Changes. It's also at the top of the screen. Look for the sheet of paper icon with a yellow pencil. Now all future changes to the document will appear as colored markup. For example, if you delete something you've typed, it won't actually disappear. Instead, it'll will appear crossed-out. Newly typed text will be underlined. Click Track Changes again to turn off further markups.