Roundcube install questions

[heylama]

I know this isn't a RC forum but I think all my questions are CPanel/WHM related.
I'm running a VPS, can I install RC to just one domain so I don't mess with other domains email? Or does the install work on all the accounts on the VPS, does it mess with their mail?
Will this keep/import existing mail that users have with Squirrel/Horde/Neo?

Looking at the directions at http://www.hostgeekz.com/guides/cPan..._on_cPanel.htm

The first thing the directions say "First make sure you know your mysql root password,"

Where can I find what this is?

Thanks for any help

[AndyReed]

The first thing the directions say "First make sure you know your mysql root password,"

Where can I find what this is?

MySQL root password is in /root/.my.cnf
Just in case you didn't set/create MySQL root password, login to WHM >> SQL Services >> MySQL Root Password