Add Next/Prev arrow on Featured Slider

Hello everyone,
I believe experts are surfing here. So anyone please try to help me. I am working on https://www.greenaer.ie/ .This is on WordPress using eStore theme. Here I would like to remove those three hanging boxes of featured slide show. It’s easy. Just to add
#switcher{
display:none;
}
. But the challenging part is Adding Next/Prev arrow there like https://made.com/ . Here the code for featured slide show:

[Too much code to post here as well]

Can anyone help me Addngi Next/Prev arrow on Featured Slider?