how to change the port 7780

[snake_eyes]

Hello,

How to change the default apache port 7780 and how to create a new virtual host for new site, because I have a separated web application must be run under apache, I wanna create a virtual host with a default port 80 and change the default port of zimbra from 80 to 8080.

Please note that I know how to change to default zimbra port, as below:
as zimbra user

zmprov ms mail.domain.com zimbraMailPort 8081 
zmprov ms mail.domain.com zimbraMtaAuthHost mail.domain.com
sudo /etc/init.d/zimbra restart

Cheers,

[snake_eyes]

Any updates please gentleman?