You use it with reverence and patience.
There is also a book you can download: http://docs.moodle.org/en/Using_Moodle_book and here is a pretty good demonstration for Moodle with good visuals (I like visuals): http://moodle.org/other/Using-Your-Moodle.pdf
I do have a question, though - If you don't know what it is or how to use it, how are you certain you urgently need it? There can be a bit of a learning curve, so if you're hoping to quickly replace your current CMS you need to be aware of that.
What CMS are you using now?
Installing and upgrading help
how to use moodle ?
གྲོས་བསྟུན་འདི་བསྡམས་ཡོདཔ་ལས་ ལན་གསལ་བརྐྱབ་མི་ཚུགས་