The configurable relays are 1,2,3,4,9 and can be modified using various parameters respectively: 300,301,302,303,304 (guidelines on page 10 of the manual) (or table image) They are designed to control some parts of the product, see table on p.7. 
 
to access the parameters, press the MENU item (3 horizontal lines) until the SERVICE item appears, then use the arrows to go down to PARAMETERS, then go up until the correct sequence of numbers is obtained. (there are no slots for digits, just go up in number). 
 
To modify the value of the parameter click on it with MENU and with the arrows up or down in number.