Super Administrators can delete Library Categories by navigating to Libraries via the menu.
Click the Library you wish to amend - usually this will be the Organisation Library but you may have additional Libraries set up. You should also have a Default Library - this should not be amended. Please contact Unicorn Help if you are unsure which Library to use.
Within the Library, click the Category Groups tab.
On this tab you will see a list of the Category Groups within your Library. Click on Categories next to the group you want to delete a category from.
A popup will open showing all the categories within that Category Group. Click the x next to the category you wish to delete. You will only be able to delete a category when there is nothing tagged to it in Content Manager - if there is, the x will not be clickable.