My site changed after 2017 update

I updated the Twenty Seventeen Theme and a couple of unwanted things occurred. 1) I cannot find or change the top image. 2) [testimonials_cycle] text and brackets show up on the page. Why? and how do fix this?

• This topic was modified 6 years, 3 months ago by lonniea.

The page I need help with: [log in to see the link]