Here is a list of actions which can be triggered in the Midnight Commander filesystem browsing mode by using function keys on your keyboard.
F1 Displays help
F2 Opens user menu
F3 Displays the contents of the selected file
F4 Opens the selected file in the internal file editor
F5 Copies the selected file to the directory open in the second panel
F6 Moves the selected file to the directory open in the second panel
F7 Makes a new directory in the directory open in the current panel
F8 Deletes the selected file or directory
F9 Focuses to the main menu on the top of the screen
F10 Exits mc