If you look at your code, it is using printLED(). In particular, it uses this line:
int c = font8x8[(number * 7) + a]; // Index into character table to get row data
All you need to do is to rewrite that line.
If you look at your code, it is using printLED(). In particular, it uses this line:
int c = font8x8[(number * 7) + a]; // Index into character table to get row data
All you need to do is to rewrite that line.