If this channel is one for which you have a paid subscription through Roku, there will be a "Manage subscription" option instead of a "Remove channel" option. Click this and follow the prompts to cancel your subscription. Now the "Remove channel" option will be shown and you can proceed to remove the channel. (Your subscription will continue to run for the rest of the prepaid subscription period, but will no longer auto-renew at that point. After re-installing the channel you can reinstate your subscription to restore its auto-renewal if you like.)
Before re-installing the channel, assure you get a clean installation by clearing your memory cache via a system restart. Depending on your Roku model and Roku version number you'll find the "System restart" option under "Settings > System > Power" or if you have no Power option, under "Settings > System".
[Note: For Roku TVs (i.e. ones with Roku capability built in) with "Fast TV Start" enabled, turning the TV off/on just puts it in/out of a standby state and does not give you a full restart. Use the menu options listed above.]
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.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X