Smart plug not connected

How do you delete s smart plug to restart it?

Go on the App, smart plugs. Click on the plug to delete, and in settings, delete it

Hi. Because the plug has lost its connection it does not appear on the App so I can't delete it. When I try and set it up again it is not recognised.

I get the message " There was an issue fetching your smart plug data. please refresh the page and try again". I try but it is stuck in a loop.