I literally just typed up the signature and added the DIVs, tables, and HTML image tags. After that I just copied and pasted.
Here's the code I use to copy and paste into our new users. Depending on how many characters it ends up, you may need to enlarge the number of characters allowed in the signatures.
Code:
Quietas
IT Admin
<div><table border="0" cellpadding="0" cellspacing="0"><tbody><tr><td width="68">
<div align="center"><img width="44" height="54" dfsrc="http://somedomain.com/images/logo.gif"></div></td>
<td width="715"><span class="style1"><font size="1"><font face="Arial"><strong>Company Name</strong> Disclaimer: Information contained in this electronic transmission or email may contain private and confidential material. Blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah blah</font></font></span></td>
</tr></tbody></table></div>
Or you can use add a simple IMG tag, take a look here:
HTML img tag