The function keys on a computer keyboard are usually shortcuts to other options. For example, you can use a function key to send off and email.
Hold down the Shift button under enter and the "-" key (beside the 0) and it makes _ . Hope it helps.
Unless you have a specially adapted version of the standard keyboard, no such key exists.This is related to an apocryphal story about a novice computer user, who encounters the instruction "hit ANY...
Space bar.
The default key for refreshing a webpage in an internet browser is F5, located among the function keys, usually found at the top of the keyboard.