The course request reports can be found in the Students top-tab. It must be run separately for each grade level:
To PREVIEW ONLY, check "No published email" under the General tab, and select "Preview" from the dropdown under the Publish tab.
You can see the previews under the top-tab Admin, side-tab Logs. They will look like regular published reports, so I recommend deleting the preview once you're done with them, so you don't confuse them with the real reports:
To PUBLISH the report, uncheck "No published email" under the General tab, and select "Publish" from the dropdown in the Publish tab.
If you want to see the course request letter (for either previewed or published reports), you can click on the Recipients side-tab, then you can download and see what each student's letter says: