GC Testimonials not providing option to post testimonials for site visitors

Dear friends, I have installed GC Testimonials, and I have positioned it from the widget panel. Now I can see the testimonial menu from the admin dash board and I can add testimonials from the admin panel. But I can’t see any option in the post / page editor to add testimonials there . Please help me .

Thanks in advance.

This is the site url http://pixmansion.com/testimonial/