Download and Install R and R Studio
R and RStudio
The first thing you need to do to get started with R is to install it on your computer. R works on pretty much every platform available, including the widely available Windows, Mac OS X, and Linux systems. If you want to watch a step-by-step tutorial on how to install R for Mac or Windows, you can watch these videos:
Next you can install Rstudio. Remember, you must have R already installed before installing Rstudio. A step-by-step guide is here