I have since found out that it is for an image. This is found in appearance – theme options – home page settings – image url.
You can save an image to your image gallery – once saved click edit – to the right hand side – file url – copy this link and paste into the image url above. You may have to resize your image depending on how big you want it to be.
If you don’t want an image then I guess the style sheet is the next option.
Hope this helps and thank you for the nice comment about the website.
