Tickets + Paypal

Hi, i have a problem with the plugin. I’m trying to connect Paypal for tickets but the connection button doesn’t appear. I saw the guide and it says about a popup but it doesn’t appear, I’ve tried on multiple browsers and devices but none shows the connection button inside the Paypal tab. Also the switch button on top left seems not to work.

The page I need help with: [log in to see the link]