tlb2webdesign on "[Theme: Photolite] "No Image" on Homepage Boxes"

How do I manually add images to the Homepage Boxes? They all say "No Image". Am guessing it's looking for an image on the linked page and there aren't any on those pages, but I would like to manually add them on just the homepage.

What dimensions should those images be as well?

Thanks!

I need to know the answer to this too. I so hope we get a response. :-) My website is completely ready to go except for that issue.