That was about as dumb as it gets 
This may help.
Assuming a working version of R and RStudio if you issue the command
getwd()
it should tell you what directory (aka "folder") that you are currently using.
For example if I do
getwd()
it comes back and tells me that I am using the directory (folder)
/home/john/RJunk
This is in Linux so the path_name will not be the same as on a Windows machine. It's been a long time since I used Windows but you likely would get something along the lines of
C:/megan/my_holidays/tenerife
Once you know where you are you can work back to where you should be. Go back to C:/megan and see what folders you have.
Alternatively Windows must have a search function! Go to C:/megan and do a search for STAM200. You should get a path there. I am sorry not to be of more help but I have not used Windows in roughly 15 years and have forgotten most of its horrors commands.
BTW I just noticed this Free Four Week Introduction to Data Science Starting January 23
He references his on-line book Preceptor’s Primer for Bayesian Data Science: Using the Cardinal Virtues for Inference which after a couple of hours perusal looks like a great resource. I am not sure it will help with your problem but it really looks useful. Anyway, back to reading.