I was on the wrong site and created 3 bad tags.
How do delete tags?
.NET WPF C#
Question is too short. That is about it - how to delete tags you created by accident?
Tags without any associated questions are deleted by the system once a day, so the simplest solution is to remove the tag(s) and wait for the system to do its thing.
I have fat-fingered a couple of unwanted new tags myself, so I can testify to the effectiveness of this method.
I see you have done this already, so .net and wpf should be gone soon. The c# tag will stay around because you didn't create it (it is applied to 168 questions here as of now, for some reason).
In the Stack Exchange FAQ:
How can we get rid of misspelled and unused (or “zombie”) tags?
and the duplicate Andriy M mentioned: I accidentally created a tag. How do I delete it?