Looking for WordPress help!!

I am looking for help with my church’s WordPress website. Crosschurch.net is our church’s only website and we have been experiencing some problems with it. The gentleman who set up the site is no longer at our church and I am unfamiliar with coding and all the details that make this site run. Our theme used to include a rotating banner on the homepage but it no longer works and we are not sure why or how to fix it. Does this problem sound familiar or fixable? I suppose anyone could help us with this problem if they don’t have to see the inner workings of the site, but someone who would be able to come to our campus might be of better help. We are located in South Florida, you are welcome to look at the site for more information if you are interested in helping.
Thank you so much.
Again, the site is crosschurch.net and my name is Samantha

Thanks