[NSFW] Post-Request for Premium Members

I have all the extensions, I want help with Post request and Membership plugins.
If anyone wants to have access to this page:https://tradeinsouthafrica.com/submit-request/details/ then should be required premium membership. i am unable to do this because it is not the page It’s auto-generated URL by the request url.

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