still struggling to use MATHLab in Snap!5.4.5

I have downloaded isnap-master guided by developer tguneysu. I found a link in the document "Snap! connectivity strategy.pdf" and got as far as adding CORS to my Opera menu toolbar but all it does is toggle between on and off through the toggling of its icon between the colors of red and green.

What am I supposed to do next to access MATHLAB?(and I know I will still be puzzleing over getting the splines portion of MATHLAB to work; that is the piece I want to reach out and use.