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When you add the widget into your Muse, you can see only a one icon.
You need to customize the icon as you wish then duplicate it and change the icon. This way you can have as many icons with the same style in your website.
Link the to all icons you can find under the Icon Settings section (Find All Icons Here). Click on the icon you like, copy the code and paste it into the Icon Code field.
There are 2 widgets in the archive. One is for rounded buttons, another for the square buttons.
I hope this helps.