umm, that should be "Arduino IDE" - not Android ISE
and it is M**a**rlin - not M**e**rlin
The solder pads on the heated bed should face down. So fish the wire through the top of the heated bed, bend them down flat onto the solder pads and solder away.
Not sure about the black heat beds, but with the red ones the solder pad should face up, not down.