Thank you page being blocked

I'm using Get Response (GR) for my auto-responder. The only way I can see to add a GR form is using the html iframe embed. The problem I'm now having is that my thank you page is being treated as a popup instead of a re-direct, and the popup is being blocked on every single browser on both of my computers until I allow popups from Wix. First of all, why does every single browser block wix? How on earth am I supposed to convert anybody at all if people have to add wix every single time. It's a complete lead-killer because the opt-ins aren't registering until the popup is allowed. Why isn't it being treated like a re-direct instead of a popup? I've scoured the internet for hours looking for a solution and have tried many different things, including trying to use a lightbox instead. It's just not going to work at all. I'm not much of a coder so looking at the wixcodes is confusing to me. If there is a workaround with the wixcodes I'll give it a try, but I really shouldn't need to. This is basic internet marketing 101...why can't I make Wix work? Can somebody please help me?