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.
Not certain I understand the question. Are you asking how to remove the Roku from its current user account and add it to another? I believe the only way to do that is to do a system reset, which removes all user information and requires setting the device back up as if new. There's no way to save the channels you have installed anyway when you switch accounts, since the installed channels are account specific, not device specific.
Dan Roku Stick (3600), Ultra (4640), Premiere (3920), Insignia 720p Roku TV, Sharp 4K Roku TV, Nvidia Shield, Windows 10 Pro x64 running Serviio and Plex on a wired Gigabit network.