How to get a character to spot here

How to make a character sit infront of the computer another character in the screen with overlays?

For the character in the screen overlay, try Joseph Evans on youtube. I think he does a facetime and tv overlay tutorial. It’s the same as what you are asking!!
And the second, you have to cut out desk and make it an overlay so it looks natural when she sits and some of her leg is underneath the desktop.
I hoped this helped!! :upside_down_face:

Thank you