I'm at the final step of my tax refund, but the country selection section isn't working—no dropdown or typing option. It seems like an interface issue. Can you help?

I'm on the final screen. Green text showing the tax refund amount. The Order Summary is on the left. A button for country selection is provided, but it doesn't work. I can neither type anything nor see a dropdown list of countries. It seems like there’s a problem with the interface. Could you assist me with this?What should I do?