Put your cursor in the Press new shortcut key field (5) and press the key combination you want to assign to color highlighting.In the Commands list on the right, scroll down to Highlight and select it (4).On the Customize Keyboard window, select All Commands from the Categories list on the left (3).You must do this now otherwise you can’t see the Highlight command. Go to Tools > Customize on the Word menu, and select the Commands tab (1).And that’s not as intuitive or as easy as you’d think because they left Highlight off the Format list! Here’s how you do it: In Word 2003 you have to assign your own keystroke combination for highlighting. It’s fine when you only have the occasional highlighting to do, but what if you’re doing a lot of adding/removing highlighting from text? You need a quicker way, right? Word 2003 Microsoft Word has a toolbar icon for applying and removing color highlighting, just like using a real highlighter.