I've gone through the tutorial on here on doing this, but I haven't had any luck.
I would rather just have the image resized if added. Is there a way to do this?
You can do this ..
Example:
postbit_signature replace it with the following template.
<hr size="1" width="25%" align="left" />
<table border="4">
<tr>
<td>
<span style="color: red;"><strong><font size="2">
<div style="overflow: auto; height: 250px; width:650px;">{$post['signature']}</div>
</font></strong></span>
</td>
</tr>
</table>
<span style="color: red;"><strong><font size="2"> => The color of the signature message..
Result: