POPULATE & LOCATE SLIDESHOW

Newbie here, please be gentle.

I’m using this theme:
https://www.elegantthemes.com/demo/?theme=SimplePress

And the client wants it to look like that. However, the slideshow is anchored to the top — under the horizontal menu. It also overlays the quote — which is in the default position.

https://danawaterproofing.com/wordpress/

Any suggestions to get the thumbnails to lay lower right (as in the theme demo) and to get the whole thing off the quote field?

Many thanks!