This guide is for all Unmarried Americans working abroad for less than ~$95,100 / year.
You have two options:
The Old, Shitty Way: Download form 1040 and 2555EZ, fill them out on your computer and finish by hand, then send them to:
Department of the TreasuryInternal Revenue Service CenterAustin, TX 73301-0215USA
Fast Way: Use H&R's Free File program which automates 90% of the process by asking you simple questions.