[mikey1991]

In the postbit or postbit_legacy of the style (depending on which you're using)

find;

PHP Code:

        <!-- sig -->
            <div>
                __________________<br />
                $post[signature]
            </div>
        <!-- / sig --> 


and replace it with

PHP Code:

        <!-- sig -->
            <div>
                <br /><br /><br />__________________<br /><br /><br />
                $post[signature]
            </div>
        <!-- / sig -->