Remove the protective cap from the ink cartridge. Insert the ink cartridge into the body of the pen. Place the cap over the open end of the pen body to secure the cartridge.
Inspect the nib wick to ensure it is pointed straight and is not frayed or split. Carefully guide the nib wick into the center of the ink cartridge until some resistance is met.
Push the nib straight in until it is seated firmly inside the pen body. Turn the pen upside down and replace the nib cap. Wait for the ink to flow into the new nib before using the pen.