[Alfa1]

Here is how you code the usergroup permissions in your newpost_usernamecode template:

Template Edit
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template name: newpost_usernamecode
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Find:
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<phrase 1="member.php?$session[sessionurl]u=$bbuserinfo[userid]" 2="$bbuserinfo[username]">$vbphrase[logged_in_as_x]</phrase>
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Below, Add:
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<if condition="$show['anonymous'] AND is_member_of($bbuserinfo,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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4,5,6,7 is the allowed usergroups. Replace by the usergroups of choice.