With new privileges come new mistakes:
I accidentally and unintentionally just created a bad tag and am unable to delete it:
Is this a higher level moderation level that can take care of it?
Don't worry about it. These things happen, and the system will take care of it for you.
Tags not associated with any question are automatically destroyed at 03:00 UTC every day.
Tags which are misspelled should have the questions under them retagged to the appropriate tag, which will result in the misspelled tag's destruction due to having no uses.