- Fork this repository.
- Create a new branch.
- Make some changes and write good commit messages.
- Create a new pull request.
For more info about this kind of workflow see https://guides.github.com/activities/forking/.
Create ticket in the bug tracker. Try to provide a good description.
If you want to discuss something, go to the #metabrainz IRC channel on irc.freenode.net. More info is available at https://wiki.musicbrainz.org/Communication.