My former roommate swapped out their Roku with mine for some reason awhile back when we were living together. When they broke off lease and moved out, we were using Roku as per usual, until I wanted to download an app and it asked for a pin. It reminded me that they indeed swapped it out. They claim they don't remember, but my point is, I need to change the email saved on this account because I don't have access to it. I don't even know whose email that is. I'd like to either get rid of the pin, or update it. I tried calling to speak with an agent, but the prompt said that they basically don't help with that situation by this time. What do I do? It's been frustrating and limiting.
Send a private message (PM) to @RokuDanny-R with as much information as you can provide. He will want the device model and serial number, and the email address of the account it's linked to. You can get all of that information on the Settings/System/About screen.
You could also simply do a factory reset on the Roku device and link it to your account. This will wipe out all existing settings, saved logins and installed channels, and you will have all channels associated with your user account added to the device. If you were using any of the roommate's login credentials, those will all be gone and you will have to use your own.
A factory reset should solve your issue.
https://support.roku.com/article/208757008
Perform the following steps with your Roku remote or the Roku mobile app.
--OR--
Located on the back or bottom of your device, the physical Reset button is either tactile or a pinhole design that requires a straightened paperclip.
Once you locate the Reset button and your Roku device is powered on, press and hold the button firmly for about 10 seconds. When the factory reset is complete, an indicator light or status LED will blink rapidly on most Roku devices.
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After the factory reset, you can then set the Roku up from scratch, adding it to YOUR Roku account.
Also note that, if your old roomie has your Roku it may still be linked to your Roku account and things could continue to be charged to any payment method attached to it.
If you can, I'd suggest you log into your Roku account using YOUR email address as known to your Roku account (not the one your current Roku shows via Settings/System/About) at https://my.roku.com) and do several things:
As previously mentioned, to connect the Roku in your possession to a different account, either to your existing Roku account or to a new Roku account you create, perform a Factor reset via the instructions given above by @Boz .