I clicked Security, but I cannot add users or groups

Right-click an item in the

Explorer

and then select

Security

to identify which user and computer accounts can access the item.

For example, if you right-click the

Users

folder, and then select

Security

, you are specifying which users can perform actions on the list of users: which users can read the list of user accounts or which users can modify the account properties such as the full name or description of a user account.

When you right-click the

Users

folder, the

Security

item does not allow you to add user accounts.

To add user accounts, right-click the

Users

folder, point to

New

, and then select the type of user account you want to add.