FYI
After Sept. 18, you’ll no longer be able to send or receive direct messages on YouTube as we focus our efforts on public convo tools (comments, posts, etc).
You can still share what you’re watching w/ others via the Share icon below videos.
More→ https://yt.be/help/9Hns
You are not alone. I've been wanting to message a few of my subs that comment regularly and even looked it up on Google and couldn't figure out how. So I have up.
Am I the only one that didn't know