How do I change the user folder name within the C: drive, i.e. "C:\Users\thoma"?

[thomas4321KH]

I bought a new laptop a couple weeks ago. This is the first laptop I have purchased and set up on my own since my parents bought and set my laptop up before I went to college. As I was setting it up, I somehow made the user folder name "thoma" i.e. "C:\Users\thoma". I need to change this to "C:\Users\thomas". I can't simply right-click and edit the name of the folder. I am not an advanced user, so the easiest and safest way to do this would be appreciated.

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