I know I probably asked a really dumb question, but I'm just curious.

On Khan Academy, you might see a banner at the top like this:

Click on Edit Profile on the right.

If you see something that says 'NICKNAME' or 'USERNAME', you're on the right track.

The site used to markup names is a 3rd-party website; but you can access multiple varying sites to markup. Just search up 'Font Changer'! Once you're there, then traverse through the website and if you find a font that you like, then copy it. Then click on your name again, delete the old name and paste the new, marked up name.

At the bottom of the box, click on 'Save' and if the name is acceptable then it will apply.

Thank you so much [even though it was a dumb question]