How do I refill the bubble solution in the ArtCreativity Train Bubble Machine?

Refilling the bubble solution in the ArtCreativity Train Bubble Machine is easy. Here are the step-by-step instructions:

1. Take off the cap on the bottle of bubble solution.
2. Use the scoop that comes with the bubble solution to fill it with more bubble fluid.
3. Connect the bottle of bubble solution safely to the train bubble machine.
4. Make sure the bottle is securely attached to prevent any leaks or spills.
5. Keep an eye on the bubble solution level and add more as needed to keep making bubbles.

Please refer to the "Setup Guide" section of the user manual for more detailed instructions and illustrations.