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 pencil button:

Next, edit the advertiser's information then click the Save button: