Did a few members of your team get a little too tag-happy? Did you make a typo when you added a tag? Fear no more, you can now delete those pesky superfluous tags from your settings page!
From your review dashboard, click on Settings, then on Study tags. You won't be able to delete the pre-populated tags (i.e. Awaiting classification and Ongoing study), but all others can be deleted from this page. You can also easily add tags from here!