Running separate accounts in the same Gnucash program

[Courtney Perry]

Currently my personal finances and my business finances run in the same file: gcashdata_1.gnucash.1. How may I now separate my personal finances from my business?2. How can I add a new (2nd) business and run it separately from my current personal and business finances?
My operating system is Windows 8.1 and I am running Gnucash 2.6.6
And thanks for the explanation on setting up the desktop icon, it worked.
Courtney