Form fields can be added to your PDF file using the AcroForms tools.
In Acrobat 6 and 7, the the forms toolbar is under:
Tools Menu > Advanced Editing > Show Forms Toolbar.
In Acrobat 8 and 9, the forms toolbar is under:
Tools Menu > Forms > Show Forms Toolbar.
In Acrobat X and XI, the Forms Palette is located in the Tools section at the top right of the screen.
Note: We do not currently support forms created by Adobe LiveCycle Designer 7.0. You will need to create your form fields as mentioned above.