How do you gently put the ribbon cable back on the Nintendo 2DS?

I going to test my 2DS after fixing my Nintendo 2DS. But how to gently put the ribbon cable back in the Nintendo 2DS?

Note: I couldn't get a screw out, so I put WD-40 to get the tiny screw that is hard. Suddenly, I snapped the Nintendo 2DS back cover. Without getting the screw off. It was almost off.

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