How do I amend my 2012 return to carryback a Net Operating Loss (NOL) from 2013 ?

I filed electronically for 2013 taxes with TurboTax online. I elected to carryback my Net Operating Loss (NOL) balance back to 2012. Should I prepare an amended return (1040X) so I can actually fill out an IRS Form 1045 carryback for 2012 ?