Our Trac is the home of the open source community that has grown up around Apostrophe. On that site you can open support tickets, browse and contribute to the Wiki, and access and potentially contribute to the source code via svn (you'll need to contact us if you want write access).
Join our Google Group and tap into the community of people using Apostrophe to get support and help. Don't forget to search the archive, someone may have already answered the question you have.