Qusetion about User Name, Display Name and e-mail

[Geek-9pm]

These three items I would like to be seperatre.

A. My user name in teh windows file system
B. The dispaly name that is visible on the dektop and lon in screen
C. My e-mail used for mymicrosoft account.

Also, I would like to have the ability to change any of the abouve without doing a lot of painfull work. Privacy is one concern. And  how can I get  rid  of the Dispaly name I chjoose in a moment of egotisim. 

So, how can I do this? Presently Windows 10 wants me to use my e-mail to sign in. What if I want to close my e-mail? Besides, it is a bother to type in the whole address. Cn't I just have a short name that is menifull on the locfal network?
As for the dsplay name, now it embarases me. 

What can I cahnge? How?

[Salmon Trout]

So, how can I do this? Presently Windows 10 wants me to use my e-mail to sign in. What if I want to close my e-mail? Besides, it is a bother to type in the whole address. Cn't I just have a short name that is menifull on the locfal network?

http://www.zdnet.com/article/windows-10-tip-switch-back-to-a-local-account-from-a-microsoft-account/

[Salmon Trout]

how can I get  rid  of the Dispaly name I chjoose in a moment of egotisim

http://winaero.com/blog/how-to-change-your-user-account-name-in-windows-10/

[Geek-9pm]

Thank you, Salmon Trout.
That is what I ned to do.