I do not have this Disney light but know which one it is. A Philips Hue Lamp often has a serial number on it somewhere or on an instruction manual; add this to the serial number list and run search for lights.
If unavailable, use Touchlink as this will always work. Try a few things like switch off and on the light before attempting the Touchlink.
See the instructions in separate post How to connect Philips Hue lights to a Philips Hue bridge?