I want to create an index grid or gallery on my home page, linking to other specific subject portfolio galleries as menu items thus other pages. I am able to create a simple gallery but for the home page I can't specify a link on click/roll. Where can i find the option to add a page URL? 

I see in the documentation for Galleries the "on click" subject but i do not know where to locate this in the various ooptions:

"On Click Set whether you’d like to attach a click event to your images in the gallery. Currently you can choose between having no click event, opening a lightbox to display the fullsized image or supplying a custom URL link."

Thanks

Thank you