Mailing list information, and subscription information can be found on the lists' page on sourceforge.Why the list:
Informing the author of problems, or asking questions via the mailing list is preferable for two reasons. One because it makes tracking down bugs, and providing support easier. Anyone who wants to look into a bug has your exact words, and bug report, and anyone who knows the anwser to a question can anwser you directly, so things aren't all filtered through one person. The second is that the mailing list is archived, so that your questions, and the anwsers to those questions are available to anyone who may have the same, or a similar problem.