To begin, go to http://admgr.liebertpub.com. Make sure you're in the correct web property. Make sure you're in the correct web property. If you're not, change the web property.

Next, click the Ad Mgmt button in the top navigation:

Next, navigate to the advertiser you want to work on by clicking the letter that corresponds to the first letter of the advertiser's name:

Once you've found the advertiser, click the file folder icon to view campaigns:

You will see a list of existing campaigns for that advertiser. Click the pencil icon next to the one you want to edit:

The details for the campaign you wanted to edit will appear under the list of scheduled campaigns:

Edit as necessary and click the Save button:

You can now view zones and add ads to the campaign or edit ads already scheduled for delivery.