You will need the following:
Open the Microbit Traffic Lights package and take out the contents.
There is a bottom part of the stand that you can snap off. Carefully snap this off and then slot it into the matching part so that it makes a stand.
Put the Microbit on top of the traffic lights and line up the holes as follows:
Once you have lined them up as above, use your Phillips head screwdriver to attach the screws and bolts in the holes.
That's it, you're done!