Only the admin can register.

[Mcvell]

And why can only the admin use the "Login" and "Registration" commands? How can I change it?

[Limeen]

You have to give the permission authy.register to your players

[Mcvell]

Hello, how do you do it?

[Limeen]

If you don't use any permission plugin copy that in your "permissions.yml" file a the root of your server:

server.basics:
       description: Basic permissions for My Cool Server.
       default: true
       children:
          authy.login: true
          authy.register: true
          authy.remember: true