Hey i'm getting a joomla site, i located it during my own lap, using no-ip, the issue is mail function isn't working,what might be the issue? how do i solve it?

This really is set up within the Administration User Interface, within the "Server" tab, mail configurations. Default is by using PHP mail - since PHP is generally set up through the host company to transmit mail not understanding any extra parameters. So for local installation you have to make sure that either your PHP is set up to transmit emails, or make use of the Sendmail or SMTP options in Joomla (and configure them there).

I really hope this can help.