Head to Marketplace > Your Profile, and in the blue notification, click "Submit Client Testimonial". This will take you to a submission form.
Fill out the form fields, including the your client's details. Once submitted, your client will be contacted by our head of agency to either submit a new testimonial, or verify an existing one you have submitted on their behalf.
Note: If after two weeks, we haven't had a response from your client, you'll be contacted by our head of agency to follow up with them.