I know this is an older post but just came across it: i too want to find, save & merge keywords, but I have no idea where the "keywords dialog" is located or where the merge function is. [Do you mean to open one file in the Mac Finder and copy the other to it, with "skip" selected?] (in a couple of times, I have lost my keywords--just came up blank when i went to use it. Same thing with the "Load" button in the metadata--it just recently turned up blank! and I had spent hours filling in metadata for sources and groups of images I am working with regularly!!)