Tutorial requires username but account has not username

When I signed-up for a Moralis server, it did not ask me for any username thus I have none on the site.

But these tutorials -> https://youtu.be/aYi1_moT4kI and https://docs.moralis.io/moralis-server/users/email-login ask for usernames. Are they referring to different usernames here? If so, shouldn’t I be allowed to create usernames and passwords on my admin console?

it is about different username, not the one that you use in your admin interface. it is about the users that would use your application, they can login with metamask or with a username and password.