Go to Admin panel > Modify template > Find Header template > then find
<tr>
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</tr>
</table>
or something like that. Copy and delte it then paste it below this or whatever you have that is similar to this
<table border="0" width="750" cellpadding="0" cellspacing="0">
<tr><td valign="top"><a href="index.php?s=$session[sessionhash]"><img src="{imagefolder}/banner.jpg" border="0" alt="$bbtitle"></td></tr>
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