Apple made the user library folder hidden by default with the 10.7 release. If it's necessary to access these files for Adobe-related troubleshooting, use one of the following methods to make the user library content visible.
Hold down the Alt (Option) key when using the Go menu. The user library folder is listed below the current user's home directory.
Note: After you open the Library folder, you can drag the Library icon from the top of that window to the Dock, Side Bar, or toolbar. That way, it's readily accessible.
The following method makes the user library folder permanently visible.
Note: Adobe recommends that only advanced users use this method.
Note: The System administrator password is not visible as you type it.
Close Terminal for this change to take effect.
For more information, explanations, and ideas, see this MacWorld article.