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I am a little confused by your question. Do you mean, should you set the input current to 1mA or less than 10 uA?
Setting the input current to 1mA would not damage the part. If you have the option though, set the input current to less than 10 uA.
Or do you mean, how can you set the input current of the photocoupler?
Setting the input current of the photocoupler may change from device to device. I am not sure what device you are using for the photocoupler (NPN or PNP) but you should be able to adjust the pull up resistor.
