How to add new tags to multiple bookmarks?

On desktop computer

1. Make sure your are on the My Bookmarks page (select the My Bookmarks menu).
2. Select multiple bookmarks.
3. New menus will appear below the Search field, click on "Edit Tags".
4. The "Edit Tags" dialog will come up.
5. Select the "Add these tags to existing tags" radio button.
6. Enter tags in the Tags field.
7. Click on "Update Tags".
8. The new tag(s) will be added to the selected bookmarks' existing tags.

On mobile device
This feature is not available on mobile devices.