What David said is correct, and there is no setting that would prevent that. You indicated "Adobe Reader" as the category for this question, which means that there is nothing you can do to fix this. Any fix would require Adobe Acrobat and permissions to modify the document. Your only way to resolve this is to complain to the document author or distributor and let them send you a form that can be filled in. Until that happens all you can do is print the form and then fill out the paper copy and return that.
Karl Heinz Kremer
PDF Acrobatics Without a Net
PDF Software Development, Training and More...
http://www.khkonsulting.com