馃憤馃帀 First off, thanks for taking the time to contribute! 馃帀馃憤
First, create an issue stating the problem and wait for an answer so you can be sure nobody else works on the same issue. Then, fork the Repo and make your fixes. After testing them (consider implementing unit or functional tests, for fixed bugs a regression test would be great), create a pull request. We will happily review and merge the request!