As for the display of information, I invite you to take a look at the code and doc that found in the end shared by SunFounder link there is C code and Python code (derived from Adafruit) for use properly, correctly using the GPIO pin that go: CPU / display memory via the C program and a program for displaying a cat (a bitmap) in Python.
A priori, the LED is not pilitable by GPIO (not necessary tracks on the circuit board to connect to the GPIO), unfortunately.
Anyway, for the price, it's okay (despite minor scratches).