Your Library folders are hidden by default in Lion and later. To get to your /Library or /Users/yourusername/Library (also known as the ~/Library) folders in Lion and later:
Launch Finder and click Go > Go to Folder and type: /Library or ~/Library
Hold the Option key while clicking the Go menu item, which reveals your ~/Library folder in the menu.
Make it permanently visible in Finder by entering the following command in Terminal, then press the Enter key: