how to custom acts_as_taggable_on?

how to custom acts_as_taggable_on?

ive had tags,post_tags,posts(Model:Tag,PostTag,Post) in my database.

i do :gem ‘acts-as-taggable-on’, ‘~> 2.2.2’ in Gemfile.

when generate migration,i found that it has generated default tables(tags,tagger,tagging).

how to custom the default option to adapt my Model?