airgov
Under the 'Reply' button on the top right side of your first post > click to edit Fields there: https://prnt.sc/poaxih
Anyway, I added the credentials of your site as you provided it via ticket.
For the image size, you can use this custom css:
@media (max-width: 1920px){
.acm-slideshow .owl-carousel .item .slider-content {
background-size: 100% !important;
}
}