Create a trusted security certificate SSL on XAMPP

Hello,
I just installed XAMPP version 1.7.4 on my laptop. When I access the localhost, using a secure connection (SSL, using https) it gave a warning about security certificates. The warning goes like this “The site’s security certificate is not trusted!”.
Well, I don’t know much about this, but how making a trusted certificate anyway? Does anyone concern about this thing or just ignore it?
Thanks.

The site's security certificate is not
