XenForo Any help here with font awesome for follow/unfollow switcher?

[KSA]

Trying to insert a font awesome icon here but failed. Not sure if I am actually using the right code.

I would to show a bell icon for follow and a bell slashed icon for unfollow, any idea?

HTML:

<xf:if is="$xf.visitor.canFollowUser($user)">
                <xf:button href="{{ link('members/follow', $user) }}"
                    class="button " style="width: 100%;"
                    data-xf-click="switch"
                    data-sk-follow="{{ phrase('follow') }}"...

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