Now that you're all set up, install RVM itself. This is done via a shell script which you can download and run directly with a single command.
$ bash -s stable < <(curl -s https://raw.github.com/wayneeseguin/rvm/master/binscripts/rvm-installer)
Append the following line to your ~/.bashrc file.
[[ -s "$HOME/.rvm/scripts/rvm" ]] && . "$HOME/.rvm/scripts/rvm" # This loads RVM
And then reload your bash environment (or close the terminal window and open a new one).
$ source ~/.bashrc