i trying to searchcode by myself and....

i don't understand how CW CHEAT FINDER work, for exemple i want to find infinit health so my caractere have 50 pts on 50 (so he's ok) i want to make a first dump, i push the dumping button and open CW CHEAT FINDER, i place 50 and clic on "cerca" and it ask me to open a file... i test with MEMDUMP.dmp but i need always to turn of my game and go to USB connection via my PSP to open it. is it normal? is the good way to use CW CHEAT FINDER?
please help me