It's not rocket surgery, use a 1K resistor and make sure you put the anode to positive supply and cathode to return. The current flows through the LED in the direction the arrow points on the schematic. If the LED is really dim or off, try a /slightly/ smaller resistor, go down to 499 ohms or something. If the LED is really bright or lets the smoke out, go up to 1.5K~2K.
'91 Pickup - Imelda
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"Our task must be to free ourselves from this prison by widening our circle of compassion to embrace all living creatures and the whole of nature in its beauty. Nobody is able to achieve this completely, but the striving for such achievement is in itself a part of the liberation and a foundation for inner security. " --Albert Einstein