Keywords provide you another method for segmenting your database into useful groups of contacts. You can learn more about Keywords here.
To add a new Keyword to your database, first go to Manage Your Account:
Then, select Manage Database Lists:
The body of the Manage Database Lists page is controlled by which List you have selected in the Manage Lists column on the right:
After you've clicked Keywords, your page will display this list. Below is an example of part of a Keywords list:
You can add new Keywords by clicking the add button in the top right corner. You'll then see the below modal:
Just type in the name for your new Keyword and click Add Keyword.
Keywords have both Edit and Delete options available from their Actions menu, meaning you can edit their name or delete them entirely.