Regarding LEDs

If I connect more than 1 LEDs to the arduino with the help of a breadboard....then only one of them is able to glow at a time. Both of them do not get the output. How to solve this problem.

Thanks in advance.

Tell us how to connect more than one led, tell us what colour they are. You need a resistor on each led you connect to the same pin.

OP, could You provide schematics for your circuit?