title: I can't find "Knit" button in RStudio
body: <p>I installed RStudio Desktop windows version to study a course on coursera, and i have to knit a certain RMD file. I installed all the packages including "knitr" but i still can't find a knit button in my interface.
  <img src="https://i.stack.imgur.com/WY1yW.png" alt="Screenshot"></p>