Hi,
Thanks for the inquiry.
You can change the email on the your Roku account by following the steps outlined in our Support page here: How do I change the email address or password for my Roku account?
Please be aware that you can only have one Roku account per email address. You mentioned that you have two accounts. If the newer account has the email that you want to change the original account to, you will need to change the newer account first to another email, then go back into the original account and change the email address.
Accounts cannot be linked to each other, but you can link multiple devices to a single device. For more information regarding multiple device, please visit our Support page here: Do I need a separate Roku account for each of my Roku® streaming devices?
Thanks,
Danny
Danny R.
Roku Forum Moderator