For adding buttons you must use button shortcode which looks like that: [button]Text[/button]
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There is more option with different attributes - text, style, href, target.
Text: You can change the text of the button. Example: [button]New Text[/button]
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Style: You can choose betwen few styles - primary, default, success, info, warning or danger. Example: [button style="default"]Text[/button]
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Href: You can add any URL to the button. Example: [button href="http://www.proteusthemes.com"]Text[/button]
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Target: You can choose if you want to open link in same (_self) or new (_blank) window. Example: [button target="_blank"]Text[/button]
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Shortcode for Font Awesome is very simillar to the buttons shortcode. It looks like that: [fa]
There is 3 options with different attributes - icon, href and target.
Icon: You can use any FontAwesome icon. And there is 479 of them. You must use just title of the icon.
Example: [fa icon="fa-phone"]
Href: You can add URL to the icon.
Example: [fa href="http://www.proteusthemes.com"]
Target: You can choose if you want to open link in the same (_self) or new - (_blank) window.
Example: [fa target="_blank"]