If the two operations are to be performed in a sequence -- first turn on, and THEN blink, you can use a Sequence structure for this. Frame zero could turn on the LED for the required time, an dframe 1 can then blink it.
However, if they are not necessarliy to be performed in a sequence, you can write to the LED from two (or more) loops (or other parts of the code) by writing to the LED's local variable. To create local variables, right-click on the LEd and select local variables.
Hope this helps. Write back if I misunderstood your question.
Khalid