>>>I read that one of the purposes is to try to find life. Let's just hope they are not so concentrated on current definitions of "life", that they fail to see life if it appears in other forms.
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>>I can imagine the instruction sheet: "Get the hell outta here! Get a life!".
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>I am not sure I understand correctly - do you mean, in case they find something which might be life, but doesn't match the current definitions?

This is just regular American slang - "get a life" is usually sent to someone who's too obsessed with something and doesn't have any private life at all. Could be roughly translated as "stop bothering us and do something about your own life".

On a more serious note, I figure the actual instructions would be to find any organized pattern of energy conversion, or a chemical reaction, or whatever, which would have at least some of the traits of life: energy use, reproduction, permanence. It would be an interesting programming task... imagine you had a standard Star Trek tricorder, write an OS for it. You get all sorts of readouts (any radiation, flux, gradient, field etc), make sense of it.