TL;DR you should just start using git and begin the process of learning. Pushing code to a project isn't really how github works, so just find a project you thi

TL;DR you should just start using git and begin the process of learning. Pushing code to a project isn't really how github works, so just find a project you think you can help and just fork, mod and push. Hence: the beauty of git: you own the repo!