seeduino mega 1.1 reference PIN I/O

hello I received iesterday the seeduino mega 1.1 card. I have some problem to reference the pin I/O. ex:
int ledPin1 = 12; // LED connected to digital pin 12
also pin 22 - 53 OK

but How to reference the pin that on the card are named PH2, PH7, PJ2 - PJ7, PD4 - PD6, PG3 - PG4, PE2 , PE6, PE7 or the analog IN 0 - 15?

I look every datasheet of ATmega1280, but I can’t found anything.

THANKS for your help … 1266009870