If he purchased the RTF, ready to fly setup then the Q and the ST10+ is already set up/binded.
If not, if he got the BNF, bind and fly or is having problems, rebind.
Turn Everything Off Bird and TX
Turn on the ST10+ but not the bird
After it initializes select Model Select at bottom right of screen
Touch and Hold the model. Menu appears. Touch DELETE.
Now turn off ST10+
Turn on the Bird. After it is on, Title Forward and Side to Side to enter Bind Mode. Light will be flashing Orange in back of Bird.
Turn on ST10+ Select Flight Settings, then Select Bind. Bind the Model and Bind the Camera
Tap Return Button at bottom of ST10+ a few times to get back to main screen. You should now see the camera come up on display.
Should be good to go now.