How to restrict usergroups from using certain functionality?

[Alfa1]

I tried to apply this code to newpost_usernamecode in order to add user group permissions to Anonymous posting
I tried adding the red section:
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<if condition="$show['anonymous'] AND is_member_of($post,4,5,6,7)"><div><input type="checkbox" id="cb_anonymous" class="bginput" name="anonymous" value="1" <if condition="$vbulletin->GPC['anonymous']">checked="checked"</if>/>$vbphrase[zointsanony_anonymous_post]</div></if>
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Do you have any idea?