You may want to get new members pre-registered for a specific class after they sign up for a plan. A good example of this is on-boarding a beginner and getting them to select their first class.
Start by Creating or Editing a plan.
In landing page section of plan setup set the redirect to Book Class.
Set all class types or a specific class type you want them redirected to.
There is a little bit of magic that happens behind the scenes with this. After the person signs up for the plan they will be automagically logged into the member portal and able to reserve the class. This way we don't need to prompt them with anything that will confuse them like: 'create an account' or 'log into account' etc. its just unnecessary.