So, number 1 should say:
1. Forward a port in your router to the E2 box on port 22, but don't use 22 as the external port, use something such as 10100, 10101, 10102, 41001, 41002, etc, just make sure it's not a common port and something above 9999 but within the allowed range.
and the last note should say:
Note - only forward the SSH port in the router (and never use the default SSH port - 22 as the external port!). Do not forward 80,23,8001,8002 or any other port otherwise its only a matter of time before you will be hacked