To use categories in your email...
- Hover your mouse on an email.
- On the right side of the email bar you will see a grayed out rectangle, click it.
- If you don't care about the names of the categories and just want to apply a color, then select a color to apply it to an email. If you wish to change the names/colors of your categories, click on Manage Categories and follow the steps below.
Another Note - You can filter by categories! At the top of your email just select Filter, then Category, and select your category.