Getting started with R how to install a package

To install a package in R call the install function in the prompt like this

install.packages("swirl", dependencies=TRUE)

Then when you have install swirl you can load in the library in your R file by using library()

library(swirl)

Now the library swirl has been loaded and you can now call the swirl functions

swirl()

Source: https://www.rdocumentation.org/packages/utils/versions/3.6.2/topics/install.packages