Basic answer is to insert a Proc call that generates the cover page as the first thing inside the ODS PDF; / ODS PDF CLOSE; statements.
What is the "cover page" supposed to have on it?
Proc ODSTEXT allows some basic text display and formatting and would be my first try.
If the cover page is complex or already created in another application you may have to use a tool such as Adobe Acrobat Pro to Insert the page into an existing document.