Report a bug
To report a bug, file an issue on Github
Try to include the following information:
The information needed to reproduce the problem
What you would expect to happen
What did actually happen
You are also invited to include:
Which browser you are using
The URL of the site
How urgent it is
Any additional information you consider useful
To contribute simply clone the directory, make your changes and file a pull request.
If you want to know what can be done, have a look at the current Issues.