We discussed earlier how to install an R package using the install() function. To use an installed package, you also need to load it to be able to use it. Let's go through this again, first with the installation in RStudio and then loading the package. Look for and click the Packages tab. You should see something similar to this:

Now, let's install the R package, xgboost. Click on the Install icon and type the package name in the Packages section of the popup:

Click the Install button. Once the package has been fully installed, the command prompt will return. To load the package in order to be able to use it, only the library() function is required:

> library(xgboost)

With this, you are now able to use the functions built in the package.