How to make <strong> on user not guests in (forumdisplay_thread)

[Jay99]

<if $mybb->usergroup['gid'] == 1 then>{$thread['profilelink']}

<elseif $mybb->usergroup['gid'] == 2 then>
<strong>{$thread['profilelink']}</strong>

<elseif $mybb->usergroup['gid'] == 3 then>
<strong>{$thread['profilelink']}</strong>

<elseif $mybb->usergroup['gid'] == 4 then>
<strong>{$thread['profilelink']}</strong>

<elseif $mybb->usergroup['gid'] == 5 then>
<strong>{$thread['profilelink']}</strong>

<elseif $mybb->usergroup['gid'] == 6 then>
<strong>{$thread['profilelink']}</strong>

<elseif $mybb->usergroup['gid'] == 7 then>
<strong>{$thread['profilelink']}</strong>

</if>

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The problem is that all users (Members & Guests) are not <strong>.

I want the Members only to be <strong>.