If you want your child to be able to use Storytel from the device that they use, you can follow these steps:
1. Download the Storytel app to the device your child uses
2. Log in to your own account
3. Go to Profile -> Settings ⚙️ and activate Kids Mode. You will be asked to enter a PIN code.
The device on which you activated Kids Mode will only have access to titles in the Children's category. The device that's logged in to your account will see your bookshelf but will not see any titles that don't belong to the children's category.