When you encounter a problem, then please read first the whole documentation in the Hatari source package and the information on this web site, this might help to clear some problems.
If your problem still then persists, you can either use the Hatari mailing list (see below) to ask for help, or you can try the well-visited Hatari forum at www.atari-forum.com, which is read by most developers, too.
There are two mailing lists for the Hatari project, one for the developers and people interested in the development of Hatari, and one for the normal users of Hatari.
The developer's mailing list is for people who want to discuss the Hatari development in depth. If you know how to code, this is the certainly the right place for you. The developers' list has medium traffic (a couple of mails per day).
This is the list for the normal users of Hatari. For example, if you've got a problem with your configuration, or just want to report a bug without being interested in the technical details, or just want to be informed about the occasional public releases of Hatari, this is the right place for you. This list has normally very low traffic (some few mails per week).