Installation problem

Hi there,

I’m trying to install the plugin. When I enter in the email, User Key etc, and click save it then takes ages and loads this:

502
The page request was canceled because it took too long to complete
What can I do?

Site visitors: There was an issue serving your request, please try again in a few minutes.

Site Owners: A request for either a page, script, process, or query has taken too long to complete and has been cancelled due to a bad gateway. You should visit your error log for more information.

Please could you advise what we need to do?

Many thanks