How do I replace the electrical innerpart from the Edison the Medium?

Here's how: 

• Turn your lamp upside down.
• Unscrew the screws.
• Lift the inner unit from the lampshade.
• Insert the new inner unit.
• Put the rubber ring back in place as well. This keeps your lamp waterproof.
• Screw the screws back in.
• Ta-da! Your lamp is working again.