gulasch-r0mstore/users/admin.py

from django.contrib import admin
from django.contrib.auth.admin import UserAdmin
from django.contrib.auth.forms import UserChangeForm

from users.models import User

class CustomUserChangeForm(UserChangeForm):
    class Meta(UserChangeForm.Meta):
        model = User

class CustomUserAdmin(UserAdmin):
    form = CustomUserChangeForm

    fieldsets = UserAdmin.fieldsets + (
            ('Additional Attributes', {'fields': ('github', 'twitter')}),
    )


admin.site.register(User, CustomUserAdmin)