<p>I think we could do with a little more information about what you are trying to achieve. I assume you're using v1.2.x</p>
<p>If you're trying to get more lines on a slide, then you can edit the theme, and reduce the font size.</p>
<p>If you're trying to put a blank line on a slide without it performing a slide break, then just put a single space on the blank line.</p>