Firstly, Log into your Admincp >>Appearance >> Style Properties >> Message Elements >> Signature and paste in the following code into the Additional CSS box:
background-image: url(styles/default/xenforo/icons/xensignature_seperator.png); background-repeat: no-repeat; font-size: 9pt; margin-top: 5px; padding: 8px 0 0;
Once you've pasted the code into the Additonal CSS box y0u'll notice that the existing dashed line is still present simply remove that instance from the drop down and your all done.
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