Open the PDF in a PDF editor that supports form fields
Enable form editing or prepare form mode
Add text fields for typed responses
Add checkboxes for yes/no options
Add radio buttons for single-choice questions
Add dropdown menus for selectable lists
Add date fields if needed
Add signature fields if needed
Resize and position each field correctly
Set field properties such as name, required, and default value
Save the file as a fillable PDF
Test the PDF by opening it and entering data
Export or share the completed fillable PDF