Slickr Gallery-Cant access all my photos in flickr

I have installed Slickr gallery and light box. Its all working. However, it only shows a limited number of photos to chose from when i create a new lightbox show. I have hundreds of photos in Flickr, but I can’t seem to find a way to access those to create a lightbox show. It looks like it only shows the most recent photos I have uploaded.

Can anyone expand on this? Do I have to upload all my photos again in small amounts to get them to show up?