Translate some strings

First, i want to thank you for good plugins, they help to my work very much, and you are really good.
I am sorry to bother you because I’m not programmer. I have some issue with translate. I can’t find some strings any where. Such as: “Serices” page title, “Testimonials” page title…
http://yhoctg.com/service
http://yhoctg.com/testimonial
http://yhoctg.com/doctor
How i can find and translate them?

URL: http://yhoctg.com/testimonial