Can't sent email

Hi the first problem I had was the when I enable the module it didn't create the mysql tables, this is fine I and a network engineer so I looked at the code
and I create the databases manually, even do I may have screw up, and this may have bring to my next problem...
I create the petition, I add it so it emails every time someone signs it.
I see it on my menu I open it I add my comments and proceed to sent it.. I click "sign" and I get:

Fatal error: Call to undefined function signit_send_signature() in /var/www/binaryfreedom.info/htdocs/modules/signit/signit.module on line 783

why is this?
if you want to see this in action the URL is:
http://www.binaryfreedom.info/node/129

thanks
Chris F.