Hi Anna,
It's hard to know what might be your problem, not being there to see what you are trying to do. However, I have been so impressed with the LEGO Education technical support people over the years. They are amazing and so helpful, and I always get a real live person right away, every time I call. They have talked me through different things, and have always fixed the problem, even if it meant sending me a new part. I would not hesitate to call them!
1-866-349-5346
Hope you figure out the problem!
best,
Sonya Shaver
FLL coach