The Lead Source Detail screen allows you to edit your Lead Source information and create login information for the Vendor Portal. Your Lead Sources use the Vendor Portal to track the leads you have accepted or returned. They can use this to test lead deliveries into your LeadExec account.
From the Vendor Portal, your Lead Sources can track accepted and returned leads. Your lead sources can also view their post documentation (how to deliver leads to your LeadExec account) and various reports to help them understand their payout.
You can also create Lead Source Campaigns from this screen and manage all of the current lead Campaigns from one screen.
You can learn more about setting up Lead Sources by reading these articles: