1) Click 'Manage Catalogs' under the 'Lists' heading of the 'Control Panel'.
2) Under 'Existing Catalogs:' select the catalog you'd like to add keywords to from the drop-down menu.
3) Click the 'Edit' button.
4) Scroll down, next to 'Keywords' enter your catalogs keywords seperated by comma.
5) When you are finished, Scroll down and click the 'Save' button.