Check the Haas website for info
http://www.haascnc.com/training/
Look in the lathe workbook (the 9484 KB pdf file) on page 119 for instructions on G76 automatic multipass threading or page 140 for single pass G92 threading.
I don't think your parameter "E" is valid. If it was meant to be the feedrate "F", you'll also have to check that your machine is running slow enough to be able to cut .8" per revolution, which is an extremely coarse thread. Most likely, you've got an erroronous value there.