Find in mamblog.html.php:
[code:1]<td class="createdate" colspan="4" align="left"><?php echo _BLOG_STATE . " " . $state; ?></td>
</tr>
<?php } ?>
<tr>
<td valign="top" colspan="4"> <?php echo $blog->fulltext; ?> </td>
</tr>
<?php if ($mask&MASK_READON && trim( $blog->fulltext ) ) { ?>[/code:1]
(about line 243)
Change
[code:1] <td valign="top" colspan="4"> <?php echo $blog->text; ?> </td>[/code:1]
to
[code:1] <td valign="top" colspan="4"> <?php echo $blog->fulltext; ?> </td>[/code:1]
Voilla