hi patrick

you shouldn't have any problems learning onto a pronto, i've learnt onto prontos and other universal remotes without any problems. some things to check:

-you've got the dongle in the ps3 usb slot (is it flashing?)
-you're pointing directly at the PS3
-when you learn you're pointing at the right point of the remote
-when learning, try different distances, and long and short presses

if you're looking for help, try telling us every step you're gone through and exactly where the problems occur.