1. Sign in your Gmail account and click ‘Option’ button, then ‘Mail Settings’ option. 2. Scroll down to the star section. There you can see ‘In Use’ list and ‘Not in Use’ list.

  2. Drag the icons you want to use from the ‘Not in use’ list to in ‘In Use’ list. It includes different color stars, question marks, exclamation marks, etc.

  3. When you want to highlight a message, keep clicking a star in your Inbox to cycle through the other option. Hope you will enjoy the tips.