- find issue for the problem
- if not found create one
- work or wait :)
In case of missing feature or a bug. Before doing anything else, please check if there is an open issue for the problem you've spotted. If not, please create an issue. The issue will be used as a mean of tracking discussion/documentation about the problem even if you'll fix it yourself.
Please link the issue in commit messages, as an example here is a commit message that references issue #1:
fix broken feature #1
I recommend the very good guide on writing best commit messages.