You can create the testimonials in the Gossh » Testimonials section.
By default there is a “Default” testimonials set created where you can add to your testimonials.
You can create many different testimonial sets and include them in different sections of the pages and posts. To create a new testimonials set just click on the “Add New Testimonials Set” button in the top right section of the window.
Adding the testimonial slider to the page
You can insert a testimonial anywhere within a page/post by using the “Testimonial Slider” button of the content editor buttons
In the “Select testimonials set” field you can select a specific set of testimonials to show on the testimonial slider.