It’s just a reverse engrave – you engrave the parts you DON’T want stamped. I can’t recall whether there’s an actual tutorial, but searching the forum for “reverse engrave” should bring up enough information to help you figure it out, and if you get stuck, we’re always here to help.
I’ve done a little playing with the concept, despite not having any kind of press – I hammered mine. EDIT: Oops, no this time I used my Cricut Cuttlebug. But I’ve hammered them too, and it works fine.
