This may sound very remedial, but I've lost my dignity enough that I don't think I have anything to lose anymore:

I found a slackware mailing list, and now I'm subscribed to it. However, I don't know how to actually submit anything. Anyone care to enlighten me as to how? I've never really participated in mailing lists, just getting info via newsletters.

actually, it would be an achievement just to get a news mailing FROM slack. slackware won't even reply to email concerning the subject. i guess they figure if you're going to get an updated or free OS on a daily cron from swaret, mailnews is redundant; if not, the newsletter is no longer just redundant, but innocuous...
i've been subscribed for two years (two seperate subscriptions, too), and have yet to recieve a mailing, batch/daily or otherwise. it would be nice to just click the email and see what i've been auto-installing for the last week.
your only alternative is to swaret --purge manually, only after you've checked /var for what's been going into your OS.
i suspect that the california border has a large >/dev/null funnel sitting on it....
seriously, patrick has a blurb about 9.1's release on slackware.com that includes the irc address for some folks that you might get the straight/skinny out of.
havalottafun!
luck -O.

I think you get me wrong: I'm not talking about an official mailing list from Slackware.org, I'm talking about a third-party mailing list by slackware users for slackware users. The url is http://mailman.lug.org.uk/mailman/listinfo/slackware if you want to check it out.

Well, it's on the page you did mention:

I feel awfully stupid....

Perhaps I should before .....