I figured it out by looking at another post, saving another page as "RetailAccounts.php" and editing the content under <!-- InstanceBeginEditable name="MainContent" -->.
Can you please recommend a YouTube video showing how to add a new page from scratch, and how to update the headers and footers accordingly, for those of us with less PHP savvy?
Also: how do I get the meta data to reflect the contents of this page? My browser window says "Product Details - Ho'ola Kai" whereas it should say "Retail Accounts - Ho'ola Kai" instead. And now I need to figure out how to edit the page in the CMS otherwise the CMS is pointless.