You're not stupid! You asked for help, that is not stupid - that is smart enough to know you needed help and you knew where to ask for it!! That is smart! :>) Stupid would have been to not ask,continue to struggle with it possible damaging the machine or not ever using it!
Also, please correct your bad report of the seller on E-Bay. The seller DID call you AND HELPED you with your problem! :>) Not everybody can answer e-mail instantly. I myself may go days before I look at my computer/e-mail, etc.