Struggling with a vendor

My inventory is so full at the moment, and there are even items from classes in there.

So yeah, I figured I might open a store and try to sell some stuff in there. Step one, acquire a vendor... easy.

Step two: set up the vendor

Not so easy

I spent the last three days trying to figure out how to do it, but I just couldn't... the How-to-guide was just un-understandable to me. Today, I spoke to the guy who brought me to this vendor in the first place, Sargas Kraken, and he took the time (over an hour) to explain to me how to set up this machine.

And he actually succeeded!