Create another account with the correct email address. Since sync deals with data which is on your devices, you won't lose any data when creating the new account. You'll just have a 2nd account with the same data as the 1st. Once sync had "done its thing" with the new account, you can log into the 1st account and change the password to wipe your data from the server; or not - it will eventually disappear after some ti,e of not being used.

I do not see an apparent way of adding a second sync account with a different email address.

I have the question..I want to change my email address just as I have done os for 30 accounts online. Im not looking to be a Junior Technician with deleting and adding accounts. Firefox/Mozilla should have a very simple way to do this in "Accounts". Does anyone know what it is?

Sorry, but the email address which was used to create the Sync Account is the account "username" and it can't be changed. You need to create a new account if you want to use a different email account.

Disconnect from your current Sync account and then create a new Sync account.

Lets see..this is 2015, isnt it?? Too bad Mozilla doesnt catch up with most others and allow a change to Username.