If you are trying to edit .htaccess files or other invisible files through the GUI, or using Fetch's automatic linkage with BBedit, you will need to show hidden files.

Open the terminal and type:

  defaults write com.apple.finder AppleShowAllFiles TRUE

killall Finder

or

1. select "Force Quit Applications" in the Apple menu,
   
2. select "Finder from the list and
   
3. click the "Relaunch" button.