If you want to delete any channel then you can follow this step-by-step guide.
Step 1: Open the WhatsApp application and then navigate to the updates tab.
Step 2: Now tap on your channels to enter the conversation window.
Step 3: Tap on your channel names on the top, and you will enter the channel settings page.
Step 4: Now scroll down and tap on the delete channel option.
Step 5: Select your country and enter your phone number. Then tap on delete to confirm delete the channel.