There is no setting to turn it off. It is the type of thing that should go away after you have seen it a few times, but eBay seems to screw that up with just about every popup they roll out until users are ready to burn the place down.
You have to do some work, and install something like Adblock Plus or other adblocker in your browser, target the popup, and block it with an element hiding rule.
I believe newer version of Adblock Plus have either built in or addon helper capability to aid you in creating the rule (I use older Firefox and older Adblock Plus and create my rules manually from a Firebug inspection of the page).
I don't see/get the popup, so can't help you with a rule.
This is happening to me, too, and it won't go away when I click either the "Got It!" or the corner "X." It flashes on constantly, over and over and over. I can't even view my seller's page. I can't check on my listings, the popup won't go away. I use a MAC. How do I get rid of it?
