Thank you so much for everyone's help!

It was working for a few minutes and now it's stopped which is weird as I don't know what. The popup window showed up but was only 100x100px so I tried editing the variables to make it 1060x700 but then the popup stopped working so I restored the files to where they were last working and now it's not popping up again. I think I'll stop for tonight and try again in the morning before I mess up anything else.