I have a second hand Classic electronic dishwasher, no manual. Previous owner left me some soap pellets "Max in 1, finish POWERBALL". I can see the slot on the front of the machine, to put the pellet into, but I cannot close the sliding cover, which keeps springing back into the "open" position. How do I close the cover? Also, where can I buy more of the soap pellets when I have used up the few pellets from the previous owner? Thanks. Ricky.