Hi Denise, I sent this reply on 25 May but don't think it hit the list.

You must already have a Password for your Administrator User Account to be able 
to operate your Mac.

Go to System Preferences > Users & Groups
Users & Groups - Select your User Account
Then Select - Login Options > Automatic Login - Select 'OFF'

When you click on the login options button, you'll find various settings on 
right part of system preference panel. Find an option named - "Automatic login" 
and select "OFF" for it to completely turn off the automatic on startup
Display login window: you can select 'List of users' or  'Name and password'

Go to System Preferences > Security & Privacy - General
You can set other security options here - Require password - immediately after 
sleep or screen saver begins or after a time.
Click on 'Advanced' for other security settings 

If you find all the options grayed out ( not selectable ), you can unlock it by 
clicking on the LOCK icon located in bottom - left corner, you have to enter 
your password to make any changes

Cheers,
Ronni

Sent from Ronni's iPad4

> On 25 May 2014, at 10:27 pm, Denise Williams <wamugh...@bigpond.com> wrote:
> 
> Hi All
> I have a 27" iMac, OS 10.7.5 . I have never setup a password on this computer 
> so anyone can access it (simply by leaving the password box empty). I am 
> about to go O/S & just in case it's
> stolen while I'm away, I want a password in place. I would like to know is it 
> as simple as just typing in a password in this box? Or do I set up the 
> password another way. Silly question I know, but it's the simple things that 
> can confuse us the most!!. 
> 
> Thanks for any advice
> Denise Williams
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