Where to enter this 1042-S?

I'm a US citizen living abroad and teaching at a foreign university. On a short visit to the US I gave two lectures at a conference and was paid a small stipend. I received form 1042-S reporting the gross amount of the stipend as well as the US tax withheld. I owe no tax due to the foreign earned income exclusion and would like to get back the US withholding onthe stipend but cannot find where to report the 1042-S information. 

Help would be appreciated.

Thank you.