Combining images

[Blighty]

(11-05-2019, 07:10 PM)User Wrote: you wrote
"5. In the layers dialogue you have Floating Selection. Right click and do To New Layer."
if I do that it create the new layer in white, so I don't do that but went  directly to "Scale layer"

From what you wrote and looking at your image it looks like you have selected "Create a new layer". Look at the attached image to see what I mean.