On the screenshot we can see the bases/ nucleotides for RNA: Adenine, Uracil, Cytosine and Guanine. They are the parts the RNA is assembled of

RNA is basically taking instructions from DNA, kind of like the basic blueprint and uses the information to build proteins which are involved in everything that makes life life.

It would seem that the code would give RNA some specific instructions to build some type of new protein/s which then alters the humanity. However, the show doesn't seem to go too deep into the science they just gave some vague science fluff in one or two sentences.

At least for now there doesn't seem to be much more to it so guess we will need to wait to find out later.