I think you just add it to the end of the macro on a separate line. I didn't see Confront Fear in the default _ProfitUI_QuickRaidButtons.txt file, but it should be something like:
<Data Name="Button1" Macro="SpellForLevel=3601331586
useabilityonplayer Parent.Target SpellForLevel
tell Parent.Target Using Confront Fear on you
" Tooltip="Confront Fear"/>
.
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