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RStudio is an editior and integrated development environment (IDE) for the R programming language. You do not need to install the R language separately, as it is included with RStudio. The software is open source and may be used freely.
More information about the software can be found at the project website www.rstudio.com.
Please also see https://en.wikipedia.org/wiki/R_(programming_language).
If you are using another computer, you can download the installation files at www.rstudio.com/products/rstudio/download/.
For questions about the software itself, please contact your teacher or the project support at https://support.rstudio.com.