What should I do now that I just received my 1042-S weeks after I filed my tax return?

I totally forgot about 1042-S before I received it. It's my first time using turbotax. I am on F1 and have been in the US since 2013 march (in an out but the earliest date on F1 is then). Do I now file an amendment? If so, what files should I include and do I file amendments for both the state and the federal?

Thank you so very much for answering...