Lenovo IdeaPad N581 User Manual page 40

Appendix A. CRU instructions
6 If two DDR3 SDRAMs are already installed in the memory slot, remove
one of them to make room for the new one by pressing out on the latches
on both edges of the socket at the same time. Be sure to save the old
DDR3 SDRAM for future use.
7 Align the notch of the DDR3 SDRAM with the protrusion of the socket
and gently insert the DDR3 SDRAM into the socket at a 30-45° angle.
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