Re: My email I logged on with is no longer in service.
Log into https://my.roku.com/account/edit using your old email address as your login name -- it doesn't matter if it's not still an active email address, at this point it's just a login name.
Update the email address and press the Save Changes button. When confirmed, this will not only change the email address shown on your Roku device(s) via Settings > System > About, but it will change your login name for your account.
Roku Streaming Stick +, 3810X, Ser YH0059427035, wifi - Samsung UN55ES6100
Roku Streaming Stick, 3600X, Ser 5S56D8240827, wifi - JVC EM37T