I cant open my roundcube

[Xbat]

hi guys


i downloaded roundcube and i uploaded into my website
but when i click install or readme.md or anything he says
Forbidden

You don't have permission to access /INSTALL on this server.

Additionally, a 404 Not Found error was encountered while trying to use an ErrorDocument to handle the request.

what should i do?

[Dennis1993]

open the URL with /installer to install roundcube.

Otherwise you can't open the README oder INSTALL file with the browser. Open it with the text Editor e.g.

[Xbat]

username_domain
    Automatically add this domain to user names for login

    Only for IMAP servers that require full e-mail addresses for login

that mean i have to type on it @mydomain.com or whati should type on it?
and its gonna register to people under my domain?

[Xbat]

PLEASE HELP

after i download it and config it, error thing happen how to fix it

Warning: system() has been disabled for security reasons in /home/<user>/public_html/installer/rcube_install.php on line 644 DB Schema:  NOT OK(Database schema differs)

    Missing table 'session'
    Missing table 'users'
    Missing table 'cache'
    Missing table 'cache_index'
    Missing table 'cache_thread'
    Missing table 'cache_messages'
    Missing table 'contacts'
    Missing table 'contactgroups'
    Missing table 'contactgroupmembers'
    Missing table 'identities'
    Missing table 'dictionary'
    Missing table 'searches'
    Missing table 'system'

[Xbat]

please helppppppppp 

[SKaero]

Slow down and read the install guide: http://trac.roundcube.net/wiki/Howto_Install