NEWER FM System
Press the top button to turn off mic and then press again to turn on. Then, get close to the amplifier and point mic toward it and keep the top button pressed down until the lights on the front of the mic blink on and off, then remove your finger from the button.
Once it stops blinking, it should be synced.
The teacher should see one light lit up on the front of the mic and when they press the top button once, it should illuminate blue. If it doesn't work, sometimes they need to try this another time.
Older FM system
If it’s the older type, use a paper clip in the spot under the battery in the mic to initiate registration, then on the right side of base/speaker. Lights should toggle then pair.