How do you advance between steps

So if I meet all the goals for say step 2, when does the system automatically advance me to step 3? Is it when I am just able to do one day of all step 2 goals or do I have to do 4 weeks at that level?

Assuming you are being honest when you log your workouts.  The workout scheduler will advance to the next step when you are capable of completing your step goals, at the mastery standard, for every workout you have in one week.

Yes. When generating schedule for new week, workout sheduler advances you one step if you have logged a progression as passed in all workouts during that week.