If you aren't able to follow these instructions, you are probably using the old version of YouTube. If you're using a newer browser, update to the current version of YouTube.
You can choose to temporarily hide content on your channel or permanently delete your channel.
Note that hiding or deleting a YouTube channel will permanently delete all Community posts, comments and replies.
Source: https://support.google.com/youtube/answer/55759?hl=en-GB&ref_topic=3024172