If you can move your cursor but the trackpad does not respond to “clicks,” try this:

1. Remove batteries
2. Open rear back-panel
3. Tighten/Losen Torx bit to adjust the mechanical “tap” transducer.
4. Close-up back of trackpad.

Detailed instructions are here: https://www.ifixit.com/Guide/Magic+Trackpad+Click+Adjustment/6171

Good luck!