I received form NR4 from Canada Revenue Agency and no tax was withheld. How or where do I enter this Canadian interest income?

Are you filing a US return or a Canadian return?

I am a US resident filing a US return.

Enter it in Interest Income - as if it is on a 1099-INT.   You don't have to enter an EIN number even if TurboTax tells you it is required.   you will be able to e-file without the EIN.   @dpdeschenes   Where do I enter 1099-INT?   Skip the import option and choose I'll type it in myself.  

Thanks, that worked! The software did keep asking for the correction, but I was able to still e-file. Will wait to see whether it is accepted now.