Linux Command Line

I am new to Linux and I have just installed AsteriskNow. How do I get to the Linux Commnad Line so that I can enter the commands to install ZapMicro’s Octasic Echo Cancellation Software? The AN CLI does not support Linux commands.

I haven’t used AsteriskNow; however, on a Linux system, i.e. OpenSuSE distro, you can press Ctrl+Alt+F1 to switch from X11 to a console and Alt+F7 to switch from console to X11.