You will only receive a message in your IRCC account for Ontario's NOI, no option to "accept" NOI. After that:
- you have 45 calendar days after you receive your NOI to apply to this stream
- you have to apply through the OINP e-Filing Portal
Regarding option to "accept" NOI not being present in EE profile: When you submit your application to Ontario through OINP portal(along with payment of 1500 CAD), your application is reviewed by OINP to see if it meets all of their requirements.
After roughly 1-3 months, when your nomination is "Approved", only then you see that "I Accept" and "I Do Not Accept" buttons in your EE profile. And once you accept this nomination, you get a maximum of 600 points added to your CRS score!