Chosen Solution
How to Upgrade Memory Ram ????
You can’t! The RAM is soldered to the logic board. But! You could replace the logic board with one which has more RAM. But there is a limit here! 16 GB is the largest you can go with MacBook Pro 15" Retina (Mid 2015, Integrated Graphics) 2.2 GHz 16 GB RAM Logic Board and MacBook Pro 15" Retina Display Mid 2015 Logic Board Replacement