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Launch the **YouTube** app on your mobile device or go to the **YouTube website** on your computer.
Use the search bar at the top of the page to search for the **channel name** you want to block.
Click on the channel name in the search results to navigate to their **channel page**.
On the channel page, click on the **About** tab located near the top of the page.
Click on the **flag icon** or **three dots** (⋮) next to the channel name and select **Block user**. Confirm your choice when prompted.