I decided to wait to submit my M1PR via efile. Now that the federal and state have been accepted, I can no longer find the efile for the M1PR. How do I get back to efile?

The M1PR will have to be mailed in and not e-filed.   

You can return to the M1PR even if you have already filed your state return.  If you'd like to Print Form M1PR: 

1. Click on the add state return,  you will not be adding a state, but this will open the return up for review.   
2. Continue to the Status of your state returns screen, then revisit the Minnesota state return  
3. Get to the Let's Check for Minnesota Nontaxable Income screen, then select Yes; I want to see if I qualify for these tax benefits. 
4. Click continue until you arrive at the Other Forms You May Need screen. Confirm the Property Tax Refund (Form M1PR) box is checked, then continue. 
5. Provide any information to generate the form.  
6. Click Print Form M1PR. This will generate a finalized version of the form, and you'll mail it to the address provided on the screen.