The function keys are programmable keys to help automatic common tasks.
For example, users can set up Function 1 (F1) key aserase” button if they use the erase command frquently.  They must go to [Menu] then to to [Erase] om case of the default setting.  As for setting up, please select [Fn. Setting] from the menu on the [System Menu] in the [Preference] of the home screen.
Verification Source: Ryusuke Hamakawa, Olympus Product Champion.