Depends on what you want to do

If you're interested in working with code, trying to fix issues on the BugTracker via patches would be a very good first step. You can contact
Nilaya to submit fixes. For contributions in Settings, try
Xillix. Art contributions are a bit harder at the moment, although I am hoping we will eventually accept them as well. Generally, art needs to come from those applying or those already on the team. You can fill out
the official application and become a prospect if you think you're ready for more of a full-time position, rather than that of a contributor.