If it's for the Forums, click the "My Forums" link located top right, and then click "My Profile." Password is toward the top. But I don't remember being assigned an initial password when I joined?
As far as I can tell, this appears to be only the Pleasureway ad that is doing this. It is advertising their new reveal at the upcoming RV show. I went to their website and expressed my displeasure with this marketing tactic. Perhaps if we all express our frustration with this directly to Pleasureway, we can cease this kind of obnoxious advertising.