Since the application was online but there’s no AOR yet, a webform with a letter and a signature. For paper-based PNP before AOR that’s how you do it.
If not, you’ll have to wait for AOR and risk losing $550 processing fee.
Another option is to request a refund so if its processed before AOR your app won’t pass the completeness check and will be rejected/returned right away.
To be sure you’re making the right steps, I think calling IRCC at 8:00am will be more helpful, I say that time because ever since May 6th their lines seem to be very busy.