@Gskelly1-
If you are referring to the email address associated with your account:
1) After your Roku account has been set up and associated with an email address, the email address is used as the login name for your account. You can still log into your account at https://my.roku.com even if you no longer have access to that email account, as long as you know your Roku account password. What you cannot do is use the "forgot password" function because it will use the email address known to the account.
2) Once logged into your Roku account at https://my.roku.com you can update your account information, including changing your email address.
After your email address has been updated and verified, this updates both the email address used to log into your Roku account and the one shown via Roku menu path Settings/System/About.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X