How do you fill a pen torch lighter?

To fill a pen torch lighter, you will need the following items: a can of butane fuel, the pen torch lighter, and a small screwdriver.
Here are the steps to fill a pen torch lighter:
Turn the pen torch lighter upside down and locate the filling valve on the bottom.
Insert the small screwdriver into the filling valve and press down gently to open the valve.
Shake the can of butane fuel and hold it upside down.
Place the nozzle of the can of butane fuel into the filling valve on the pen torch lighter and press down gently to begin filling.
Fill the lighter for approximately 5-6 seconds or until the lighter is full. You may hear a hissing sound when the fuel is being added.
After filling, release the valve on the butane can and remove the nozzle from the lighter.
Wait a few minutes before using the lighter to allow the butane to settle.
Note: Be careful not to overfill the lighter, as this can cause damage to the lighter or even create a dangerous situation. It is also important to use only high-quality butane fuel for your pen torch lighter.