Using sIFR to replace page titles

I recently installed the dynamic rendering module along with sIFR in order to replace key text on my website. One of the things I want to replace is the page titles. The problem is the suggested CSS Selector doesn't seem to be working. To replace the page titles it suggested "#tabs-wrapper h2" but that doesn't seem to be doing anything. I have firebug installed and know how to use it to look into the css of pages, however I'm not quite proficient enough to figure out what's going wrong and what I should actually put in the CSS Selector box. Could anyone give me some advice? If it helps I can give my website address and you can go look for yourself.

Thanks in advance to anyone who can help.