Adding Testimonials via the WordPress Customer Testimonials plugin is pretty easy. Click on the
Add New under the Testimonials menu, then simply add the testimonial information, then publish it like any other post.
You can create as many testimonials as you want based on your customers number, you can actually have unlimited number of testimonials.
*Please, make sure you fill all fields to allow the plugin to function properly.
Here is how the add new page looks like (click the image for larger view):