Step 1: Dismantle the Charger
There are no screws holding the two pieces together, but there are 6 evenly spaced out notches that you will have to very carefully pry out with either a thin screw driver or knife.
Step 2: Locate the Buzzer
The way I found my buzzer was by looking for a relatively (and physically) bigger piece of component compared to other components on the breadboard.
The buzzer works like a speaker, so it would have to be physically big enough to hold a magnet and a coil inside.
If it has numerous connections to the breadboard, then it's probably a microcontroller. (like in the picture)
Step 3: Take the Lid Off the Buzzer
With a sharp tool, carefully pry off the lid off the buzzer.
Be extra cautious not to damage other components on the breadboard!
It barely took any effort for the lid to pop right off! (See second picture)
Step 4: Take Off the Diaphragm (the Top Plate With a Magnet)
With a sharp tool (I actually used my finger nails), remove the diaphragm so that there is nothing for the magnetic field to move. (See picture)
Step 5: Reinsert the Buzzer Cap
However for me, I didn't know if in the future I would want the BEEP sound again whenever I'm using my charger, so I taped my diaphragm on to the lid of the charger, so that in the future, I can reinsert the diaphragm and have a beeping charger again! :)
Step 6: Reassemble and Enjoy!
No more loud beeping noises! :)