Hi, @garyeholt.
Greetings from the Roku Community!
We appreciate you reaching us on how to upgrade a subscription. We're here to help.
If you're upgrading the subscription through the app, launch the app, log into your account, and go to subscriptions in the account settings to find information on how to change plans (this may vary depending on the streaming service).
Furthermore, you may visit this support article on how to switch to a different subscription plan through Roku
We hope you'll find this information helpful. Let us know if there's anything else we could further assist you.
Thanks,
Reynan
Reynan L.
Roku Community Moderator