First, there is no monthly charge just to use a Roku. If you're paying one then it's possible you've been scammed. You can't add a second email to a Roku account. What is the email address that shows up on each Roku when you go to Settings->System->About? Do they match? Is it your husband's? Can you log in at https://my.roku.com ?
If your husband isn't available you can always create your own Roku account with your own email address temporarily until he is. As I said, there is no charge for that. Later when he is available you can perform a factory reset and then link it to your husband's Roku account. If you create your own account any subscriptions you pay through Roku won't be available, but anything you subscribe to directly (like Netflix) will ask you to log in. Any free channels will be available, but you have to add them yourself.
