Accessing phpmyadmin and roundcube

Hi guys...

I have installed ubuntu server and virtualmin web panel and everything working fine.

Let say my domain name is domain1.com. When i install some features like phpmyadmin and roundcube from the install scripts, these features are easily accessible like "domain1.com/roundcube" or "domain1.com/phpmyadmin" which i think are less secured.

Are there any other way to access phpmyadmin and roundcube for example like the user must log in into the virtualmin and access these both scripts ?

Thanks.