How to change icon for an app

I use Zorin OS 18 and for some applications they show up on the menu just fine but when I open it up on the taskbar it shows the default icon how do I make the icon show up in the taskbar?
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You can use this guide:

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You could take a Look in the preinstalled Program ''Main Menu'' and look there for the Entry of the Program. Click on it and then on the right Side on Properties. A little Window opens. Click on the Icon to change it.

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