Unsuccesful Ruby installation


Hello everyone, could anyone help me?

I’m trying to install the Ruby (Jekyll), but when I open the “cdm” and I want to verify if it was succesful installed, it says normally “ruby” it is not recognized neither an extern nor an intern command , program or file by lots executables. By the way my computer is Windows version (10.0.01734.345).

Any suggestion? I would appreciate your answers, I might not go through the course because I’m stock on this point.

If I may install another relative program, let me know, too.

Thanks again and have a nice day everyone.