Lost the slide show facility

I was looking at my website https://www.leighharringtonphotography.co.uk and noticed that my slideshow facility wasnt working. When this happened before the web designer fixed it but has now decided not to bother with customer service. Anyhow I updated to 3.4.1 and its still doing itwhich means people can easily logoff the site and I might loose their interest and thereby custom. I hope someone can guide me to a simple button I can click to restore the slideshow facility…please.
many thanks Leigh.