Testimonial Section Setup?

Login Your Site, Dashboard Appearance =>> Customizer =>> Front Page Sections =>> Testimonial Section =>> Content =>> Enter Title, Name, Designation, Description, Link, Upload Image, If you want to delete the Testimonial box click on the delete Testimonial line and if you want to increase the Testimonial box then click on add new tab then Click Publish Button.

For more help see the attachment given below:-