Qustodio does not require a passcode during the installation process. If you are asked for a passcode during the installation, this is the passcode of your device, which is the code you have set to protect your device with Apple when you first set it up. This code is not related to Qustodio.
If you forgot the passcode for your device or you entered the wrong passcode six times in a row and you're locked out, please follow these instructions from Apple Support.
If you have any questions or concerns, please contact our Customer Support team at https://www.qustodio.com/help/contact/