Restrictions password? How do I figure out the passcode !

Hi, please have a look here: If you forgot the passcode for your iPhone, iPad, or iPod touch, or your device is disabled - Apple Support

You cannot ”figure it out”. You either know it or you don’t. If you don’t then all you can do is restore the device as new to reset it. Do not restore from a backup unless that backup was made before you first setup the restrictions passcode.