OK, so I entered a question and when specifying the tags, entered them as 'space' delimited instead of 'comma' delimited, or whatever the correct format is.

Is there any way to edit the tags associated with a question? or to remove a tag? or to add additional tags after the question has been asked?

There should be some UI hint, or label text telling you how to enter multiple tags. the help text is not helpful.  

SUGGESTION: The format for entering tags should be displayed on the page.