Yes, you can use TurboTax to file a non-resident return for Canada. 

I can't find where to enter the  gross income,only cpp,pls guide 

What is the code of the income on the NR4?

46

Enter the amounts on the T4AP slip. Put Box 16 from the NR4 into Box 14, 15, 16, 17, 18 or 19 (whichever type the income is). Put Box 17 from the NR4 into Box 22 on the T4AP slip. You may also have to put a number of months in either Box 21 or 23 depending on the type of income you received.