Attention all prospective immigrants

[pakistan]

Here is a problem regarding my case

I had a refugee claim which was refused and as the appeal. I got Saskatchewan nomination and applied for PR as a provincial nominee at Buffallo Newyork.
I came back to Pakistan and meanwhile medical instructions were issue and later on done.
Now i am in Pakistan and my application in process at Buffalo, how shall I submit my Passport to visa office? Can I apply for authorization to return to Canada or do I need to do something else?
I have my three kids already citizen of Canada and with me in Pakistan.
Please adivse me thanks