If a user wants to connect to an external share/server on a Mac, do the following:
1. Click anywhere on the Desktop
2. In the top menu, click Go
3. Click "Connect to Server" (the last option)
4. In the popup window, type in
smb://whatevertheserveraddressis (a Windows server)
or
afp://whatevertheserveraddressis (a Mac server)
NOTE: the user should know the server address and have the login and password if their server requires that.​