Please add job duties (particularly special payroll) to the offer letter generated by PageUp. You will need to add this to the letter before submitting hire request to HR. This will require you to download the offer letter from PageUp and re-upload the updated offer letter.
Once you get HR approval to hire, OL cannot be changed -> you will have to contact HR for them to make this change before updating status to Make Online Offer.
If offer accepted and you then need to change letter, contact HR and ask that the letter be revised. Note that the applicant acceptance will be rescinded, revised OL uploaded by HR, you will need to notify candidate to accept the updated offer.