just copy and paste this
change the $pstID to match your post….
add it to sidepart DIV
//Fetch specific post and put in the page;
copy code below and change pstID appropriately
make sure to include php tags
<?php
$pstID=389;
$pst=get_post($pstID);
$pstCnt= $pst ->post_content;
echo $pstCnt;
?>
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