Saving as MP3

I am using Windows 7 with Audicity 2.2.2 and am new to Audacity. I am trying to figure out how, after editing an MP3, to be able to save it so I can share it with people on Facebook. Also are there any good tutorials of 2.2.2 that can help me use it?

You’ll need to add the FFmpeg libries to export to Mp3 - see:Installing and updating Audacity on Windows - Audacity Manual

See the Tutorials section of the Manual: