G800 SD electronic cash register

G800 SD electronic cash register

Hi how are u hope ur fine, ,may kind assist me with my G-800 SD electronic cash register,, the upper black button that use 3 keys is missing ,the one that is used to control the use of the cash machine I don't know how i missed it ,and the machine is still brand new never 4been used before, may you kindly help me with replacing that button and please assist me with giving me giving me the user manual again I misplaced it. thanks you