Firstly, navigate to your list of Testimonials.

On the right-hand side above your list of Testimonials, you'll see a blue button that says '+ Add new Testimonials item', click this and you'll be redirected to adding a new Testimonial.

This will redirect you to your Testimonials' Standard Fields.

Once you have filled out these fields, click save.
Your new Testimonial will appear in your list of Testimonials.

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