Lastly, the tool is currently only available using GIT. If you are not familiar with it, I suggest you read up on it and learn. The entire tool is built around you keeping your project, and modules in GIT. (and other places too, but mostly GIT)
uModules is still in development so there is no official package available yet to download and install. The best way to get uModules right now is to use GIT, which is why it is listed here. In future versions, you will be able to install uModules and use it like any other command on your computer. (At least that is the goal)
Once you have everything installed, head on over to the Quick Start Guide to see how to use the tool.