Saving image only once?

I can save an image immediately after the rendered result, but if I render it and do some other stuff on the image I can’t save it. Can’t see my image in the UV editor. I can only save an image only after I rendered it, and if I loose the “rendered result” below, I can’t do anything about it. So please help.

First, I have a question for you. If you don’t have a texture (as per your previous post) why are you using the UV Editor, what did you unwrap, and by what measure did you determine that it does not work? (Really, it is one answer for the whole thing.)

As for the saving of renders, that is correct. When you change a scene Blender assumes, correctly, that you are done with the last render. It’s not gone, just pushed aside. Incrementally saving your work (especially before you render) might help.

Have you read any docs or watched any vids? (This is a question which you answer to yourself.)