The following information is from their website.
"After you receive a PT Notification of Interest from Ontario through your MyCIC account, you have 45 days to apply to OINP under the Human Capital Priorities Stream.
To apply, fill out the Nominee Application Form (see Section 4 for instructions on completing the form) and ensure that you have all the required supporting documents (see Section 3).
All applicants must indicate which federal immigration program they wish to be assessed against: FSWP or CEC.
OINP will assess your nomination according to the Human Capital Priorities Stream eligibility criteria. Your application will also be assessed to ensure you meet the FSWP or CEC criteria."