I just did what it sounds like you want to do using these instructions for Acrobat Pro 9. Here is the link: http://help.adobe.com/en_US/Acrobat/9.0/Standard/WS3593E0A4-C5E2-4cde-A09E-2A984346DDD2.w. html
To make it so your user can save a copy go to the Advanced Tab and click on Extend Features in Adobe Reader. That should do it. Good Luck.