Cannot find Sharepoint list

Jovi-365 Correct. This is your SharePoint list URL where you have Power Apps customized list form and where you must be storing the form data: 

https://<tenantName>.sharepoint.com/sites/<siteName>/Lists/Trade Requests/Open Trade Requests.aspx

Open Trade Requests is the name of your list view which is set as default view in your list.

If you want to access all items/records in the list, you can try this URL:  

https://<tenantName>.sharepoint.com/sites/<siteName>/Lists/Trade Requests/AllItems.aspx

AllItems is the SharePoint default view created when you create a new list. It should be available for you unless someone else deleted it.

If you want to set the All items view as default, open the respective view & follow steps in my answer at: How to set a view of a Microsoft List as the default view 

Related documentation for list views: Create, change, or delete a view of a list or library 

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