In this question, I intended to create a tag "bhavishya-purana", but by accident I typed "bhavishya-puranas" with an "s" at the end. I tried fixing it, but it wouldn't let me put "bhavishya-purana" because it's too similar to a tag that already exists. Is there any way I can get my accidentally created tag deleted and put the question under the proper tag?
This is a known problem with the Stack Exchange software (at least, I consider it to be a problem) - if you have created the tag "bhavishya-purana", you cannot create a tag that differs in pluralization ("bhavishya-puranas") nor a tag that differs in hyphenation ("bhavishyapurana").
The only real solution is for someone with moderator privileges to change the tag to have the correct pluralization. We should have mods in a few days, so I recommend waiting until then.
Update: this is done!