How do I reset the check engine light in a 2004 Jeep Liberty?

I need to get my car inspected this weekend and I don't think it will pass with the check engine light on. Can anyone tell me how I can get this light to turn off so I can pass my inspection? Any help would be appreciated.
Update: @itsjust me: How do I disconnect the battery? Is it easy or hard to do? Thanks for your suggestion.
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