To reset the password you must access the login page of the platform. In the middle are two buttons: Don't have an account? and "Forgot Password?". Click on Forgot Password? and redirect to:
Here you will enter the E-mail address and press the Recover password button.
An email will be generated to reset the password. This email will reach the address you entered.
Now access the email address used for Kinderpedia and you will find the e-mail for resetting the password, click on the email and click on "Change Password" (see the picture below).
After clicking on "Change password" it will send you to the Kinderpedia page where you have to enter the new password twice and click on "Save" after entering the new password.