There is a few ways to access the network drive or share drives. The easiest method is to click Finder (icon with face) and then press the following keys; Command + K. This will bring up a "Connect to Server" window in which it asks for the directory of that network or share drive.
Looking at the window above, the + symbol will add that directory to your favorite servers listed in the window. - symbol will remove that shared drive from the favorites list. Clicking Browse will allow you to browse whats currently within that shared drive folder as will connect unless you type in the name of the folder.