Not sure I understand. What do you mean?
would like to have the webmail function is there anyway to do it? I when around doing some google search there is a way using round cube, but I already have my mail up and running is it fine to run the add on called roundcube.
Roundcube would be run on a server to provide webmail, but I don't think that is what you are after.
Who is your email provider now? If your provider like Gmail or iCloud.com offers a web mail service you can access that through the Safari web browser in Mavericks. Is that what you are after?
I'm hosting my own mail server.
Roundcube requires PHP/MySQL or possibly other databases.
You'll need to run the latest version required by RoundCube if Mavericks does not have it installed.
You then enter the server information to configure Roundcube.
However, I believe you can enable webmail from within Mac Server and use their interface instead of roundcube.
There is no webmail interface built into Server 3 (Mac OS X Mavericks). I have installed Roundcube on a couple of servers using various guides found on the web. Have another to do next week and will be using Roundcube Installer to do this one as it looks a lot less hassle than manually fiddling with the config files.