Apple - How to access my .ssh folder for Transmit or Cyberduck?

In the find file window, press Command-Shift-G. It'll ask you what folder to navigate to. Enter ~/.ssh and press return.

You need to tell Transmit or Cyberduck to show your hidden folders. The . in the folder name is part of why it is hidden.

In Transmit, there should be a menu option in View -> Show Invisible Files. Cyberduck may have a similar menu option in the View menu, but it may say Show Hidden Files.

This will let you see it in the application. If you need to see it in an Open file dialog, press cmd + Shift + G` while the open dialog window is open. This will drop down a "Go to the folder" screen. Type in the hidden folder path you wish to navigate to and that folder will now display in the open dialog window.