How do I update/edit my landing page URL?

Click "Manage Advertisers", then choose the advertiser you wish to to edit and click "Details". After that, scroll down until you see "Campaign creative list" and then click "Edit".

You can edit your landing page in the Campaign Creative List. To get here, click "Manage Advertisers" on your home page, then choose the advertiser you wish to edit and click "Details". After that scroll down until you see "Campaign Creative List" . To the right of this, you should see your landing page URL and the "Edit" button which is what you will click to edit your landing page URL.