image caption

Hi,

Is there any way to add a description of the photo instead of ‘image 1 of 15’ in the lightbox?
Also my images are not displaying at their full size, it seems to have a width of 300px in the code, how can I change this?

Thanks

Link to page is http://revivalcafebarandgrill.co.uk/test/

https://wordpress.org/plugins/lightbox-gallery/