When you sign up, Parler asks for your children's names. You can add more later from Children. Each child has their own library, their own reading languages and their own sign-in code.
How many learners you can add depends on your plan: 1 on the free First Page plan, up to 4 on Storybook (and during the 14-day free trial) and up to 8 on Bookshelf. Co-parents and family viewers are always free and don't count. If you're on one of our earlier plans (Starter, Family or Pro), you keep its learner limit until you change plan.