How do I file an amended return through TurboTax?

[crgerkin]

I already received my refund, but I received an additional 1099-R form.

[ErinH]

Amendment instructions can be found in the helpful FAQ below:  

Note: You cannot e-file an amended return.  They have to be mailed, and it takes up to 16 weeks for the IRS to process an amended return. 3 weeks after you mailed your amendment, you can start tracking its progress at the IRS Where's My Amended Return? site. https://ttlc.intuit.com/replies/6602873