How 2 Clean Up Tags : Denizens of the cyberspace bit-bucket

Currently (in my opinion), there is an unfortunate trend to create overly complicated tags. That being said, I should hasten to say that some are very useful, but that the vast majority of them should be consigned permanently to the bit-bucket. As a result, I ask, is there a way in which to edit the tag list? I do not wish to remove them all, but there are many that are totally useless that I want to edit out. Thanks.

Mark Lee