Hi Guys - please let me explain a bit better.
I've found an example of the kind of think i'm looking for on a sitepoint tutorial, which I now have working on my site:
http://www.sitepoint.com/print/users-php-sessions-mysql
In the tutorial it takes you up to the point where the session logs you in and says 'Hello $name' - you have now entered the website.
...But what I NOW want to do is use the session which remembers the ID that's logged in and allow the user logged in to do (1,2 and 3 as shown on the screenshot):

...But only for listings with their ID.
Understand now people? Can anyone advise?
Ta
Chris