how to pair ps3 controller to ppsspp?

[thedicemaster]

plug OTG cable into your phone/tablet.
plug USB cable into OTG cable.
plug the other end of the USB cable into the controller.
map the keys using the option under game settings-controls.

if that doesn't work, root or get a proper mobile controller.

and you really should learn some patience.
it's unreasonable to expect an answer on a forum in less than 11 minutes.