Hi,
Welcome to the RStudio community!
You either have to use the pull path name (e.g. from the root of your computer) or the path relative from the current working directory.
So if you have a windows machine you can for example call a file like this
read.csv("C:/Users/username/Documents/Rfiles/myFile.csv")
#Or if your getwd() says: C:/Users/username/Documents
read.csv("Rfiles/myFile.csv")
The fact that your path starts with '/' suggest you are on a linux or mac right? Try and see what the full path is in the file explorer.
Hope this helps,
PJ