To change the email ID from which a scheduled report goes out, you would need to first add that email in your list of Outbound emails. Follow this document to add an Outbound email -> Adding New Outbound Email.
Step 1: Sign in to your WPRemote account.
Step 2: On the WPRemote site listing page, select the website of your choice.
Step 3: It'll take you to the site details page. On this page, go to the Reporting section & click on Edit.
Step 4: This will take you to the report page. Here, you can scroll down to the "Email From" section to select which email the report goes from.
Step 5: Once you have made the change, you can click on "Save" & that will save the change for the scheduled report.
