How Can I Put This Icon In My "add To Cart" Button?

I’m using “font awesome” in my store,

and I’d like to use this icon ↵click here

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<i class="fa fa-shopping-cart"></i><br />

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on my add to cart button, like this: [url=""]![](upload://ktCbGq7Mqpe6jwnigsesgPsOXYw.png)↵click here[/url]<br />
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As you can see, I've added already many icons in my buttons, but in the "add to cart" button has been difficult to me on all my tests.<br />
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Someone can give me a hand? some help would be very appreciated. thanks! <img src="upload://oPnLkqdJc33Dyf2uA3TQwRkfhwd.gif" class="bbc_emoticon" alt="8)"><br />
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