How to use Derma Pen and Muscle Base Revitalising Set. Let’s get started if you’ve received this, or it’s on the way, here’s how to use it right! How to Use Your Derma Pen Safely and Effectively 1. Charge It Up Start by fully charging your Derma Pen before first use. 2. Attach the Cartridge Select your preferred needle cartridge. Align and gently twist it onto the pen until it’s secure. 3. Power On & Adjust Depth Switch on the device. You can adjust the needle depth by twisting the cartridge hea