With great difficulty.
MS-Paint is a very simple tool. You can cut and paste, but you cannot blend edges or do any other adjustments to make the final image look like anything other than what it is — a crude cut and paste.
Windows 10 has Paint 3D, which offers a “smart select” tool to help snip an object by detecting its edges; but there’s no real blend or other tools you’ll need to make a convincing cut-and-paste, so it’ll probably still look awful when you’re done.
You need a capable, full-blown image-editing tool to do decent face-switching. Photoshop is one obvious choice, but there are others, including the free, open-source Gimp.
But note: To get good results with any such tool, you’ll have to spend some time learning it. Creating a convincing face-swap isn’t a simple thing!
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