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You didn't say exactly what was going on, it was probably a temporary problem with the computer, or it could be stuck, please.
Level up first, then buy furniture.
Popularize to a one-star restaurant and it will give you one. The conditions are: 1. The restaurant reaches level 10. 2. The area reaches 11 11. If these conditions are met, you will be fine.
It means that the guest is eating, and there will be food coins when the guest leaves.
At the bottom of the game panel, there is a long bar for putting food, when the customer has the desired food on his head, wait or entertain other customers, when the time is up, the food will appear on the bar, and finally click on the food and walk next to the customer.
After playing, he will show how many coins you have earned, you are looking at the box carefully, there is an upload, you just click.