Help! My Image Gallery is showing only Thumbnail sizes

Hi,

Can someone help me? My image gallery is only showing thumbnail size views and I don't know how to make them larger. Is that the default size for all images? They are 300 X 300 and way too small to really show how the image looks like.

Can someone please tell me what may be wrong? My site is at http://www.ofcchawaii.org.

Thank you,
Virgil