Hey, is the signature campaign still going? I signed up through the form. Do I need to do anything else?
It looks like you didn't read the opening post and details of this campaign very carefully. Also a few posts earlier, other users report that this campaign has already ended over a year ago.
Answering your question - you don't have to do anything, just look for some actual bounty campaign
However, if you want to support the project gratuitously, then certainly developers will enjoy your generosity.
