A QUICK TUTORIAL RE COMBINING IMAGES.
Take photo number 1 - background in this case
Take photo number 2 - subject
Trace around subject with magnetic tool Select all LAYERS, then cut image
Now take photo 1 and paste the cut image onto that photo or drag and drop.
I have deliberately left this rough around the edges but you would be more careful and refine it before cutting it. There are smoothing tools etc.
Clean up your image and manoeuvre subject into place.When satisfied click layers and select flatten image AND ……………………………Bobs your uncle
Before anyone shouts at me there are many ways to achieve the same result but I think this is the simplest. Working with layers can be complicated, well, I found it so for a very long time.
Give it a try. I am totally self taught and unable to understand instructions but, the more you play with a programme the more you learn,