Cant connect Koyeb db instance with app

Hello, it’s my first time using this app, and im trying to deploy a simple Django app, using the postgres db provided in Koyeb, and i followed this tutorial:

But for some reason i cannot make it work, when i do in the terminal
python manage.py createsuperuser, im getting an error like the tables dont exists, can somebody help me?

Hello,

Did you run python manage.py migrate?

With django, this command applies the migrations to the database.