Considering this, how do I change the frequency on my garage door opener?
Modern garage door openers do not rely on a frequency. They have a code that is transmitted to the receiver. To change the code, there is a reset button on the garage door opener motor. Once this button has been pushed, you have 30 seconds or so to push the button on your remote a 2 or 3 times to reprogram it.
Beside above, how do I change the code on my garage door opener? Change Code on Garage Doors with a Keypad
Depress the button on the side of the motor and hold down. Let go of the button when the light next to it goes out. This will remove the old code from the garage door openers memory. Depress the button on the garage door motor once again until the light comes back on.
Also asked, why is my garage door opener beeping every 30 seconds?
Your garage door might be operating on battery power. Whenever that happens, the opener will beep to let you know it's running on the backup battery. Your backup battery might be running low on power or unable to recharge. If your garage door opener beeps every 30 seconds, you might need to replace your backup battery.
Why do I have to keep resetting my garage door opener?
Make sure that you have good fresh batteries so that a strong signal gets to the garage door opener base unit. Your opener could be picking up some stray signals from their opener and making yours get out of sync with your transmitter dongles.