Once  You have Purchased the Service . You can Go Ahead and Complete the Checklist 
You can Send us The Files Through the Upload Page .

Here is the Checklist –
 All songs are in their individual folders with the folder name as the Song Title and all folders are in one ZIP file.
  All exported files are at least 44.1k / 24bit .WAV files.
  You’ve included your rough mix in the package you’re sending to us.
  If you did not include notes as you were filling out the purchase form, you have included an organized PDF with mix notes for each song.
You have included, in your notes, your best available times to Contact You