You can operate the buttons by a short click with the mouse and the button will light up shortly.
Keyboard users can use the corresponding shortcuts.
Keys Functions << Take back three moves (shortcut ALT+B) < Take back a half-move (shortcut "-") REBEL - Make a move or, if the program is already calculating, stop calculating and make an immediate move. (shortcut ALT+M); - if in player <> player mode this button has been changed into "-----" by clicking it (shortcut ALT+M) player <> player mode will end and Rebel will start calculating; - This button can change, depending on which engine you have changed Rebel to via menu "Option", into R 9.0 R 8.0 or R 7.0 or R DEC still having the same meaning and shortcut as above; - This button can also change into R<number> if you have entered a specific ELO-number via menu "Option". Meaning and shortcut are same as above; - This button will change into GAME in the analysis mode which will allow you to restore to the moves that were current before you started analyzing (shortcut ALT+M); - This button will change into EXIT while analyzing a game or a database and allows you to abort the analysis to return to the current game. (shortcut ESC) - If the settings are NOT optimal for Rebel the button will not have "REBEL" in upper case but in lower case: "Rebel" > Move forward a half-move (shortcut "+") >> Move forward three moves (shortcut ALT+F)