That’s IP1.
IMM5669e Schedule A is Backgrnd Check form, its a routine form received by many applicants. It is available on CIC website. You can google it to get the link. Download and fill out the form, print it out and pen-sign it, scan it and upload it on your CIC application account, you will see placeholders created for this in your application (if they have asked for your spouse as well, then there shall be two, one for each applicant). If the space is not enough on form, you can add extra pages with your application details and tables similar to what you need to fill in form. You need make a single pdf file for each applicant and file size <4MB. After uploading, submit the application again.
Please note the date before which they have asked to upload this form. Probably it will be a week deadline from date of ADR.