If you have a Windows 10 Pro edition,  the management of local users and groups con be easily handled right clicking on the Start  menu icon, choosing Computer Management and then selecting the Local users and Groups folder. From this windows you can see all the users defined in the PC (even the built-in Administrator) and manage both their roles and their password (if the logged user have admin rights).

Windows 10 Pro – Local User and Group management

On the contrary, if you have a Windows 10 Home edition, like it was in Windows 8, Local users and Groups folder is missing in Computer Management as it is unable to connect to active directory so there is no real need for it, so you can only manage users in the old fashion way, through Control Panel -> User Accounts.

Windows 10 Home – Change user role in Control Panel -> User Accounts

_______________

To add Local Users & Groups Snap-in, you can follows the instructions available in this post that talk about the use of the Microsoft Management Console application (mmc.exe) to display various management plug-ins accessed from the Control Panel, such as the Device Manager or the Local Users & Groups management:

• Run mmc.exe from the Run dialog box;
• From the Management Console window click File -> Add/Remove Snap-in;
• Select Local Users & Groups [Available snap-ins section] and click Add;
• Choose Target Machine window, click Finish).

This will add the Local Users & Groups Snap-in to Windows functionality and you can use it

Snap-in insertion

 NOTE: Come attivare la funzionalità Anti-Adware di Windows Defender su Windows 10 (anche in Windows 10 Home edition)