[SmashinYoungMan]

It's in the navbar template. Look for this bit of code:

		<div class="smallfont">
			<strong><phrase 1="$bbuserinfo[username]">$vbphrase[welcome_x]</phrase></strong><br />
			<phrase 1="$pmbox[lastvisitdate]" 2="$pmbox[lastvisittime]">$vbphrase[last_visited_x_at_y]</phrase>
			<if condition="$show['pmstats']"><br /><phrase 1="$vbphrase[unread_x_nav_compiled]" 2="$vbphrase[total_x_nav_compiled]" 3="$session[sessionurl_q]">$vbphrase[private_messages_nav]</phrase></if>
			<if condition="$show['pmwarning']"><br /><strong><phrase 1="$vbphrase[pmpercent_nav_compiled]">$vbphrase[your_pm_box_is_x_full]</phrase></strong></if>
		</div>