If your browser has a Tools setting, go there and click Internet Options. In IE9 I click that and in the window that comes up I click the Privacy tab, and in there I have an option for the pop up blocker. I click on Settings...

... and can add a safe site to the list to always allow pop ups from.

Let me check out Safari's process for this...
Well gee.... Safari is so much simpler as far as pop ups go. Go to Tools and if the line that says "Block pop-up windows" has a check mark next to it, click it and it will be unchecked. Or you can push CTRL/CMD+SHIFT+K.
Let us know if this works. If not, are you using Tapatalk? I don't know if that makes it easier, but you might could give it a try if the pop up deal doesn't fix it.
... and can add a safe site to the list to always allow pop ups from.
Let me check out Safari's process for this...
Well gee.... Safari is so much simpler as far as pop ups go. Go to Tools and if the line that says "Block pop-up windows" has a check mark next to it, click it and it will be unchecked. Or you can push CTRL/CMD+SHIFT+K.

Let us know if this works. If not, are you using Tapatalk? I don't know if that makes it easier, but you might could give it a try if the pop up deal doesn't fix it.