Interactive PDF not populating fields

Hi there, My university has given a PDF template with fields to populate. here are the instructions: 

Using the PDF form

• The Add a New Drug tab allows you to add drugs to your drug list. You can enter the relevant Drug

details into this page, click “Add this drug” button and it will add it to your drugs list. You can

continue to do this for each drug you need to enter for your patient. If you need to remove a drug

from the drug list please use the “Remove drug” button next to your entry.

• Import AR details – you can use this button to import relevant details from your paired AR. Some

auto-populated from your AR will not be editable in the Progress Note. You can revise your AR and

re-import any changes, if required.

Whenever i go to clock add this drug, nothing happens! pls help