XenForo How to change button icon?

[0ptima]

Id like to change the lightning bolt icon to a different Font Awsome icon



Here is the code

<xf:button href="{{ link('addon') }}" icon="bolt"> New </xf:button>

I want to change the bolt to this

Font Awesome ​

fontawesome.com

However, changing the icon to stopwatch does not work
<xf:button href="{{ link('addon') }}" icon="stopwatch"> New </xf:button>

Do I need to do something else to make it appear?

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