How do I add an established page address to my shopify site?

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I have a QR code with a linked web address - - thats been printed on garments for years and I need to add that page to my shopify site, but I can't figure out how to add a fully custom address to my sitemap.  The best I've been able to get is  -*customtexthere*, or*customtexthere*, etc . Is it possible to do what I am attempting within Shopify?  Please help.