Thank you for your response.
This is all really over my head :/
I added a group called ‘Everyone’ and gave read & execute permissions – following the user AsharamSeervi in the first link you gave me, however this has not worked.
the location of the site on my computer is
C:\Users\Owner\Documents\Websites\www.marisnaps.dev.cc
i changed the permissions from the ‘Websites’ folder down but no luck, i still can’t update plugins or upload images.