Hi @Bahareh
We warmly welcome you to the Friendly King Community's Candy Crush Saga forum.🤗
Coconut Wheel is a pre-game booster, That means you can select the booster at the beginning of a level, but you can't use that booster differently on the game board.
The pre-game booster is selected according to the level structure which means that there will be no chance of using the booster at the beginning of each level.
Let me know along with a screenshot if you have any other issues.😉
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