How can i turn on multiple leds when the gnd and 5v are already used on the power side
Hello helmus101
Post the wiring diagram to see how we can help.
Generally for anything being driven by a micro, you should power the peripherals (i.e.LEDs) directly a power supply with sufficient current for the intended load.
Remember when needed, the ground / 0V should be tied together as a common reference voltage (0V)
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Do you mean they are connected and you have no way of disconnecting them?
You can join two or more wires together and connect them to the same pin.
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On boards like Uno, Nano, Mega thete are pins for Vcc and ground on the ICSP headers.
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