I just got a new Macbook today and its really nice! However, I have a small problem. I want to add certain files to a folder inside one of my applications, and I get a message that reads: "The item '(name of item)' could not be moved because '(name of folder)' cannot be modified". I realize that this is an issue of who has permission to access and modify files, but Im the only user on this Mac so far, and nothing I do seems to grant me access. How do I fix this problem? Thanks!