Renewal
Add time, change nothing
A renewal extends the line you already hold. Server address, username and password all stay exactly as they are, so no device gets touched and nothing needs re-entering the night before a fixture.
Use the same email address you originally ordered with. That is what links the renewal to your existing subscription. Renewing under a different address creates a separate line instead of extending this one.
Identical credentials No device reconfigured Added on top of what is left
Renewing a day or two before the expiry date is the tidiest approach, because the extension applies to a line that is still live. Not sure which email address you used? Message support and we will look it up.