How to insert signature in yahoo mail youtube

I think there may be a bit of confusion here!

You can't directly insert a signature in a YouTube video. YouTube is a video-sharing platform, and signatures are typically used in written communication, such as emails.

However, if you're asking about how to add a signature to your Yahoo Mail account, I can help with that!

To add a signature to your Yahoo Mail account:

1. Log in to your Yahoo Mail account.
2. Click on the gear icon () in the top right corner of the page.
3. Select "More settings" from the dropdown menu.
4. Scroll down to the "Writing email" section.
5. Click on the "Signature" button.
6. Enter your desired signature text in the text box.
7. You can also add formatting options, such as font styles and sizes, by using the toolbar above the text box.
8. Click "Save" to save your changes.

Your new signature will now be added to the bottom of your outgoing emails.

If you're looking to add a signature to a YouTube video, you can't do so directly. However, you can add a link to your website or social media profile in the video description or comments section, which can serve as a form of digital signature.