There is a set screw in the two-speed transmission that will adjust the shifting point. You need to losen the screw to make it shift earlier and tighten it to make it shift later.
If it is not shifting at all, you may needt to disassemble the transmission and check to see that the enganment finger or pin is not broken.
You will need a set of snap-ring pliers to get the c-clips off. This will be a good learning experience for you in dealing with transmissions maintenance. Althought the Team magic's car transmission mechanics are different, the principle is the same.
You can get manuals here