Emachine e520 turn synaptics touchpad on/off

[Guest]

hello, i have a emachines laptop e520 and one of my little brother and sisters have done something to my touchpad and the buttons and none of it works, it had not been damaged i think it might of been disabled but i cant figure out a way to get it working again and its really annoying me, HELP

 

[Jim_L9]

On many laptops if you double tap the left top corner of the touchpad it will toggle between on and off.