We are really happy that you are interested in contributing to JabRef. Please take your time to look around here. We especially invite you to look into our community members page where members introduce themselves.
I am not a programmer
I would like to improve the help page. What are the steps?
Donations keeps us going! You can use Paypal, Flattr, or bank transfers. Your institution/company can contribute too, through bank transfer for example. All details are provided at https://donations.jabref.org.
Our team consists of volunteers. To provide better support, we are currently trying to get a funded developer on board. Please consider donating money!