If your friend is running Lion or later, 10.7+, the Library folder is hidden.

Open "Terminal" (located at /Applications/Utilities) and execute this command (shows all hidden folders anf files): defaults write com.apple.Finder AppleShowAllFiles TRUE

Then in "Terminal" use this command to close your find process: killall Finder

Restart Finder and all hidden folders should now be visible.

Now, in Finder, click on your User folder, then Library, Then Application Support. Your Minecraft folder is listed here.

To hide hidden files/folders in Finder execute this command in Terminal (then restart Finder): defaults write com.apple.Finder AppleShowAllFiles FALSE

Alternatively, you can execute this command from Terminal to open your "Application Support" folder in a Finder window: open ~/Library/Application\ Support/

If your friend is running Lion or later, 10.7+, the Library folder is hidden.

Open "Terminal" (located at /Applications/Utilities) and execute this command (shows all hidden folders and files): defaults write com.apple.Finder AppleShowAllFiles TRUE

Then in "Terminal" use this command to close your find process: killall Finder

Restart Finder and all hidden folders should now be visible.

Now, in Finder, click on your User folder, then Library, Then Application Support. Your Minecraft folder is listed here.

To hide hidden files/folders in Finder execute this command in Terminal (then restart Finder): defaults write com.apple.Finder AppleShowAllFiles FALSE

Alternatively, you can execute this command from Terminal to open your "Application Support" folder in a Finder window: open ~/Library/Application\ Support/