ISPConfig & SSL certificate

When the ISPConfig Apache is built, a custom SSL certificate is built. Can I change some of the elements of that certificate (e.g. certificate validity) or should I delete it and create a new one?

 

I would delete the old and create a new one because I don't know it better and I guess changing fields will end up in the same process - generating a cert...

 

And how would I do that?

 

For example in this tutorial: http://www.howtoforge.com/linux_apache2_ssl_php5_zendoptimizer_ioncubeloader

 

Also have a look here: http://www.howtoforge.com/forums/showthread.php?t=121

 

ok, thanx for the references guys.