My name is Michael.
I can help you with your question.
If you look straight in the front where the cars go, you will see a horizontal red plastic bar... this is what launches the cars when you press the release button on the top.
I actually have a video that you can look at to see exactly how it works. I will give you a link to that. Please take a look and let me know if you have any questions.
Click on this link below, or scan the qrcode with a mobile device to see the video.
I know how to use the product. The red bars do not lock anymore. Any idea how to fix it?
It worked for a couple months but now neither of them work.
Yep. I check that out.