The user’s Library folder is a hidden folder in the home directory. To access it, follow one of these three methods:

1) Open a Finder window, and press Command + Shift + G. In the “Go To The Folder” window type ~/Library and press Enter.

The "Go To The Folder" window in Finder.

2) Open a Finder Window. Press and keep pressed the Option key on the keyboard. From the “Go” menu of Finder, choose “Library”. This option is normally hidden, and it shows when you press the Option key.

3) Open Terminal.app (located in Applications/Utilites). At the command prompt, type ~/Library and press Enter.