R software need package installation
Text mining package is like add on for R software to perform multiple text mining operations. First you need to install text mining package from going to tab packages in R software.
Then go to install package, you will find CRAN mirror. Select any one from them randomly. Then a window appears with lots of built in packages. Select tm package and installed it. You will get the notification of successfully installed.
Keep in mind each time you open R software you need to load tm package to make it workable. If you are not going to load package, you will find it workable.