MAMP Log-In

I installed and set-up the Subdomain module on my live site. I would now like to go back to working locally. However, I'm finding that when I attempt to log-in all of the tabs on the .../user page point back to the live site's URL, not my local directory. Thus it tries to log me in the wrong site and I'm effectively locked out.

As far as I know the only place I entered the live domain into the site anywhere for it the remember was during the set up of the subdomain module... in the setting.php file to replace:

$cookie_domain = 'example.com';

How should I update this to work for my MAMP install. Just obvious does not work:

$cookie_domain = 'localhost:8888/directoryName';

Any thoughts?

Perhaps there is something I need to know about configuring MAMP for Subdomain to work?

Thanks!