1. Unscrew the pen barrel to access the ink cartridge.
2. Insert a new ink cartridge and screw the barrel back on securely.
3. Hold the pen at a comfortable angle and let the ink flow smoothly onto the paper.
4. To maintain the pen's performance, clean the nib regularly with warm water and dry it thoroughly before use.
5. Store the pen upright when not in use to prevent ink leakage and maintain optimal performance.
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