As IBus Cangjie is a Cangjians project, it is subject to our general guidelines for contribution, so be sure to read them first.
That being said, there are a couple of things which are specific to IBus Cangjie.
First of all, it is written in Python 3, so if you want to contribute to the code, you'll need to know a bit about that.
Of course, when looking at the list of open bugs, if you find one you would like to fix, just go ahead and send us a pull request.
We love pull requests fixing bugs or implementing new features, especially when they come along with new unit tests!
Finally, because IBus Cangjie is user-visible software, it needs to be translated. We use Transifex for that, so if you want to translate IBus Cangjie in your language, head over there and submit your translations.