Code:
myRelay.setDirection(Relay.Direction.kBoth);
myRelay.set(Relay.Value.kOff); // M+ and M- = 0V
myRelay.set(Relay.Value.kForward); // M+ = 12V, M- = 0V
myRelay.set(Relay.Value.kReverse); // M+ = 0V, M- = 12V
myRelay.set(Relay.Value.kOn); // M+ = 12V, M- = 12V
Wire as per instructed in posts above with grounds of your LED directly to power distribution.
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