0 to write the necessary information on an official document: --
to fill in a form/questionnaire
Charlie never fills in the record forms, which ruins the whole ordering system.
Would you mind filling in a questionnaire about what you watch on television?
Please fill in/out the application form with black ink.
To find out more about our products, fill in the coupon and send it to us at the address given below.
I had to fill in this really complicated form.