I went to the help page for assistance in setting up a page.
Use the custom page size
Choose File > Page Setup.
Select the new custom page size from the Paper Size menu, and click OK.
Unfortunately, I am unable to find the menu item "Page Setup" in my File menu in Adobe Acrobat Professional 8.1.1.
Do one of the following:
In Acrobat, choose Advanced > Print Production > Acrobat Distiller.(Windows) Choose Start > Programs > Acrobat Distiller 8.0.(Mac OS) Use the Finder to locate Acrobat Distiller 8.0, and double-click it to open the Distiller application.
My favorite quote - "Success is the ability to go from one failure to another with no loss of enthusiasm.