Thanks! Earlier this morning I did determine that I'd overlooked a critical portion of the instructions, as you've accurately noted. Newbies, I tell you...
I checked the option box above the sample code and received the revised code which includes the POST form bit, and was able to quickly integrate that into my home page.
I've got some work today to make it look better on the main sales page, but at least now I fully understand the process.
BTW, apart from my glaring ineptitude, the sales process is working perfectly, and my PayPal account balance is increasing quite nicely, thanks in no small part to your fine service.
Kruncher, who learned something new today.