How to acivate

hi

i^v installed responsive lightbox (http://wordpress.org/plugins/responsive-lightbox/) and additionaly “lazyest gallery”.

the lazyest gallery seams to work – but if I click on an image, to open it with lightbox, there are no arrows to move to the next image within the same folder or to move back?

does this functionality exists or how to activate?
thanks

http://wordpress.org/plugins/lazyest-gallery/