If this is a channel for which you have a paid subscription through Roku you cannot remove the channel while you are subscribed to it. If you unsubscribe, the "Remove channel" option should then appear when you highlight the channel in the home screen channel grid and press the * button on your Roku remote.
Roku Community Streaming Expert I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well. If this post solves your problem please help others find this answer by clicking "Accept as Solution.".
Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X