Here is how to use net user command to add,delete or change users in command prompt
net user [username] [password] or [*] /option
Options:
/Add /Delete
net user [username] [password] to change password
net user [username] /Active:yes or no
Convert standard user to administrator
net localgroup Administrators [username] /add or /delete
Next video how to limit time for accesss and kick user out after time expired :)