Transform freestyle 2 into mcg

I want to transform my freestyle 2 sensor into an MCG.I have seen several open threads in the forum but I don't know where to start.I have already taken the first step: new mobile with NFC and now what do I do?Please, I would appreciate very simple instructions why technology is not mine.

There is a page on Facebook that is called Nightscout Spain
Make and Bichea, there is a lot of information, many tutorials and files.So without more, it is difficult to answer you.It depends on what your mobile is and more.Get member and ask there, it's Page for that.Luck.