Click on the Sequence to export and choose >File>Export>Media or click "Command M"

Choose 

Format = QuickTime

Video Codec = Apple ProRes 422 or HQ

Then choose Audio Options

Click on the "triangle" twirlldown

Choose More

Make sure Stereo is selected

Next on the source options make sure the Entire Sequence is selected

Or if you had in and outpoints marked choose Source In/Out

Click on Output Name - and choose where you want to save the file.

Navigate to your hard drive and title the file

Last step is to Click Export to begin exporting the file.