Add a content category:
Click the Manage tab in the left-hand side menu of your dashboard
Hover over Content Categories and click the content type for which you wish to create a category (e.g., Event Categories)
Click Add New
Type the name of the new category
Select Add New Category

Delete a content category:
Click the Manage tab in the left-hand side menu of your dashboard
Hover over Content Categories and click the content type for which you wish to delete a category (e.g., Event Categories)
Locate the category that you wish to delete
Hover over the category and click Delete
A prompt will appear to confirm your choice; select Ok

Note: Deleting a category does not delete content associated with that tag
Edit a content category:
Click the Manage tab in the left-hand side menu of your dashboard
Hover over Content Categories and click the content type for which you wish to delete a category (e.g., Event Categories)
Locate the category that you wish to edit
Select Edit
Edit the category as desired
Select Update

Note: There is not a limit to the number of Content Categories that can be created in a given category. The process for managing content categories is the same for all content types.