I am going to assume Because of your PC Experience and perhaps a new Mac user.
In Office PC You can actually access Files directly from within The application. Whereas Mac Although You Point to where you want to save and you can double-click to open a file or use Open Command from the File menu there is no Direct access (you can't for example Delete a file from with the application).
What you do is, you go to the File from the finder by opening the hard drive then go to menu or submenu you save in. Then you can drag item to Trash or you can click to select file then go to File menu and choose Move to Trash.
If the above is not the issue, (I am trying to give more than one possibility).
Then You might have an Issue with permissions. On Systems prior to EL Capitan, Locate the Disk Utilities Program, then open and choose Repair Permissions.
On EL Capitan to Repair Permissions :
- Quit all applications.
- Restart Computer while holding down Shift key.
- Continue holding shift key down until you see a progress bar show on the screen.
- Once you see Progress Bar you can release the shift key.
- Wait until it ask to sign in (use same sign you use to install software).
- Let it finish loading.
- Now restart normally.
- Now try to access you files.
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