what is the key step of "merging" two images?

[kenny1999]

(05-17-2021, 10:46 PM)Ofnuts Wrote:

(05-17-2021, 08:31 PM)kenny1999 Wrote:

(05-14-2021, 01:34 PM)Krikor Wrote: Among the possible technical options, one is shown in the video: https://www.youtube.com/watch?v=2e6FikWMkaQ

I tried to follow the steps of the video but at the point of eraser, the eraser doesn't erase.
then I am stuck at this step, what is the problem?? status said the layer is "locked", but 
I haven't done anything

Check for any "set" icon in the Lock: line at the top of the Layers list when the problem layer is selected (likely Pixels (the brush) or Alpha (the checkerboard))

Hi. I don't understand...

On the Lock: line there are three icons
Lock Pixels
Lock Position and size
Lock Alpha channel

And below that there are two layers... 

OK I show you the screenshot...