How can I set the text in the "Description" box to print/appear left to right, rather than centered?
Edit themes/yourtheme/theme.php, find$template_display_mediaand edit as suggested below. If that section doesn't exist in your custom theme, copy// HTML template for intermediate image display
$template_display_media = <<<EOT
<tr>
<td align="center" class="display_media" nowrap="nowrap">
<table cellspacing="2" cellpadding="0" class="imageborder">
<tr>
<td align="center">
{IMAGE}
</td>
</tr>
</table>
</td></tr>
<tr><td>
<table width="100%" cellspacing="2" cellpadding="0" class="tableb">
<tr>
<td align="center">
{ADMIN_MENU}
</td>
</tr>
</table>
<!-- BEGIN img_desc -->
<table cellpadding="0" cellspacing="0" class="tableb" width="100%">
<!-- BEGIN title -->
<tr>
<td class="tableb"><center><b>
{TITLE}
</b></center></td>
</tr>
<!-- END title -->
<!-- BEGIN caption -->
<tr>
<td class="tableb"><center>
{CAPTION}
</center></td>
</tr>
<!-- END caption -->
</table>
<!-- END img_desc -->
</td>
</tr>
EOT;
from themes/sample/theme.php into themes/yourtheme/theme.php into a new line before?>and then modify it. You need to modify <tr>
<td class="tableb"><center>
{CAPTION}
</center></td>
</tr>as you see fit - remove the <center> and </center>-tags, then add some wrapper into the table cell or apply your custom alignment to the table cell itself, or just leave it as is (without the <center>-tag), as left-alignment is default. For my taste, the most elegant solution is to replace the snippet mentioned above with <tr>
<td class="tableb" style="text-align:left">
{CAPTION}
</td>
</tr>to specifically set the alignment.
Hope that helps.
Joachim