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Hello @Buffet7 and welcome to the community. Some of the items in our inventory can be used as pre level boosters and some can be used during levels. Not all items can be used on every level though. The pre level boosters are the colour bomb and wrap+stripe booster as you can see in this screenshot:
I have no wrap/stripe but one colour bomb on this screenshot. To play the colour bomb I need to click on it and a green tick will appear, meaning I will get this booster added to my starting board. To untick, click on it again.
The third pre level booster is different for each level, sometimes it's fishes, or lucky candy as in this screenshot, or it's the coconut wheel. You can only use whichever the game allows on the pre level screen.
The other boosters from your inventory, that you can use during a level, will appear at the bottom of your screen during play, and those you can use at any time. You can see those at the bottom of my screenshot here. Just click on the booster you want to use.
I hope this answers your question.