code for saddle node bifurcation

I need to create a code for a saddle node bifurcation diagram for the Henon Map with the following parameters a=-.1225 , b=.3, the equilibrium point is (2.8571,.8571) all the information that you need is in the picture and the graph is supposed to look like the one on the picture

please i am new to matlab so i dont really know how to code so explain the code if possible