How to write in adobe acrobat?
You can only fill in a PDF form using Adobe Reader or Adobe Acrobat Pro if the creator of the form actually made an interactive form out of it. If it is, the fields should be very visible, and you can just click and type in the fields. If it is just a “drawing” of a form, then you will have to print it out and fill it in by hand, or for a more professional user you could create the form fields yourself (using software that is able to edit the PDF, like Adobe Acrobat Pro).