Tag Spam On catalan fòrum there’s a couple…

TagTag Tag is one of the pre-defined taxonomies in WordPress. Users can add tags to their WordPress posts along with categories. However, while a category may cover a broad range of topics, tags are smaller in scope and focused to specific topics. Think of them as keywords used for topics discussed in a particular post. Spam

On catalan fòrum there’s a couple of tags that seems spam:

There is no topics with theses tags.

How have they been published? How can I delete this tags?

thanks a lot!