Do you mean register to use the forum on their site?
http://www.adobe.com/cfusion/webforu...184&forumid=44
Found three addtional email links in the support section. Does require looking through a few pages before getting to that point. They kind of like for users to search the forum and other options before actually dealing with a problem. Less hassle, saves them money, and time that can be used for more productive purposes than answer the same old questions over and over. That seems to be what many software sites these day seem to do from my experience.
Flashplayer cost nothing so if registering is required it seems no big deal. There is no registration serial number I know of. Just give email address if concern on anything else. Again it may take them time to answer.
Brian