How would I add extra LEDs to an NES

Im trying to get my old Nintendo NES system to have extra LEDs kinda like this system HERE or this system HERE or even this system HERE and final this system HERE
How do these people power the extra LEDs ? And where do I connect them?

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110100101108 years ago
for just allways working leds + the 13 V before the 7805 - any part of the metallic structure inside the box wow it actually has schematics enclosed !
jackillac92 (author)  110100101108 years ago
which picture is that in? sorry lol
the 1 st schematic 7805 is at the top
jackillac92 (author)  110100101108 years ago
Thanks man! What resistor should I use for the LEDs?