How do i to up grade memory for MacBook Pro laptop?

MacBook Pro
2.6 Ghz
Intel Core i5
Processor Turbo boast up 3.1 Ghz with 3 mb
128 GB PC

8 GB of 1600 HZ DD 3l on board memory

Apple Memory Module 16GB 1866MHz DDR3 ECC SDRAM R-DIMM - 1x16GB

Apple Memory Module 16GB 1866MHz DDR3 ECC SDRAM R-DIMM - 1x16GB

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