The interactive text fields are common on job applications, official forms, contracts and any other document where the creator controls the fields and the user can only input data into the fields ...

Adobe added the option to mark fields that can be filled out with text, boxes that can be checked, and other helpers for form completion at least a decade ago–so long ago, it’s hard to find out when.

Try Foxit Reader 4.3, which allows you to add text to any PDF. After installing the program, simply open your PDF in Foxit instead of Adobe Reader, then click Comments, Typewriter Tools, Typewriter ...