You would file an amended return for the 2016 tax year, if after you moved in August 2016 you met the 330 day rule over the next 365 days. (some file an extension until they meet the 330 day test).
For 2017, you would file a return with the Foreign income exclusion.
For the amended return for 2016, please click on the following link for help.
https://ttlc.intuit.com/replies/3288565
