Lenovo IdeaCentre B520e Hardware Replacement Manual page 19

5. Push out the latches on both sides of the memory socket to release the
memory module and gently pull the memory module upward to remove it from
its socket. All of the memory modules can be removed by using the same
procedure.
6. Align then insert the new memory module into the socket and push down on
the top edge of the memory module. Make sure the latches lock the memory
module in place.
7. Align then slide the computer cover back into position.
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Hardware Replacement Guide