You can create a guest account on a Windows 10 computer by using the Command Prompt feature. Here's what you'll need to do.
I use my own individual Windows computers at home but also share a PC with my wife and my cat, Mr. Giggles (don't ask). To ease that process, I set up dedicated accounts for each person (and feline).
To change your account name on a Windows 10 computer, you'll need to go through your User Accounts menu. Here's how to do it.