buying and selling

I've never used Gunsbroker before. Is it possible to pay for a firearm from Gunsbroker auction using a debit card if the seller has Visa/Mastercard under payment methods? If so, umm where would I navigate to on the website to run the card. Sorry if I sound completely clueless. I'm not trolling.

I reported one gun and a rifle as stolen while I was living in Nevada a couple years back (originally purchased/ registered/and then 'stolen'' in Nevada ) Long story short, both guns have been found (not by law enforcement) but I now live in CA. What do I do? I assume I call Nevada Police or...