I will try to help you – but right now I don’t understand exactly where you are in the process. I mean, did you manage to install and run Animation Paper?
You say “the tab is open”? That seems weird to me. Do you mean you are using your browser? Having you browser open doesn’t make any difference. Animation Paper is a stand alone software. You need to install it and get your activation key and then you are all set to go. You can check out the video tutorials that pops up when you first start Animation Paper on how to use it and animate. But did you get to that stage at all? Please get back to me with a little more info – and I will help. 🙂