Help getting started with Roku devices, including setup, connecting your device to your TV, linking a Roku device to your account at my.roku.com/link, adding channels, subscribing to services, and more.
If you log into your device's current account at https://my.roku.com you can create or reset a PIN value. You can then choose when the PIN is to be required, such as before it will allow any subscription or purchase to be made on your account, or add a channel.
But it sounds like you are still linked to your friend's Roku account. A factory reset will be needed to set this Roko up from scratch and link it to an account of your own. Factory reset is accessed via Settings > System > Advanced system settings > Factory reset.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X | Streaming Stick 3600
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