Click the finder Icon:
To go to folder Structure click finder > select Go from menu at the top (you may need full screen the Finder page to see the Go menu:
The select computer (this is also where you can find out the Mac’s Computer Name).
Then select the Disk Icon (It is usually untitled unless the user has named it)
You will be then given the 4 main directories:
Applications
Library
System
Users
Here you can browse whatever folder you like.