11-24-2014 12:50 AM
Good day and welcome to the community.
As with many Ultrabook machines, the RAM is soldered to the system board, so there's no way to upgrade it short of swapping in different board. You may want to have a look at your hardware manual for reference: http://download.lenovo.com/ibmdl/pub/pc/pccbbs/mobiles_pdf/s1_yoga_hmm_en_sp40a26742_01.pdf
Not what you wanted to hear, I'm sure.