I. No longer have a roku device I use my android phone or fire tv but it won't let me add the android device. I have the app but can't add phone or other apps
It's not clear what you're asking, but there's no substitute for a Roku device if you're wanting to run Roku apps. All that's available is the mobile app or the Roku Channel website.
Roku Mobile App - Free for iOS® or Android™ | Roku
https://therokuchannel.roku.com/
If you have subscription through Roku, then you may need to cancel them and sign up separately. Not sure if you can find the right account to sign up without losing your watchlist and other settings.
Yet another reason to NEVER subscribe through Roku or any 3rd party. It's always best to sign up DIRECTLY at a service's web site. (I'm talking about paid subscriptions, and not ones that come with services like Walmart+ or similar.)