thanks so much cin . . . i dont have a mouse and where is system tray . . . just researched but couldnt find
Using the USB mouse, check the link for how to (Disabling or Enabling the Touchpad section) http/www.dell.com/support/Article/au/en/audhs1/619773/en#Disabling%20or%20Enabling%20the%20Touchpad
System tray is the area by the clock.
There is probably a key combination to turn on/off the touch pad, Function key and one of the F keys most often, or some touchpads have an area you can press on for a second to turn it off, look at the manual for your model. May also be some custom keypress like Ctl-Shift-T or something. The manual will tell you.