Hi @Vassilios,
Welcome to the Roku Community!
Start here for step-by-step instructions on how to Remove channels from within the channel lineup.
- Press Home on your Roku remote
- Move to the right and highlight the channel you wish to remove
- Press * on your remote to open the Options menu
- Select Remove channel and confirm when prompted
For full information on this, you can take a look at this link: How to remove channels from your Roku® streaming device | Official Roku Support
Hope you'll find this info useful. Let us know in case you've still got any questions.
Best regards,
Mary
Mary F.
Roku Community Moderator