In order to list to eBay through ecomdash, you will need to setup eBay business policies directly on your eBay account. There are three different policies: Shipping, Return, Payment and you will need 1 of each.
The business policies for eBay is an item that may require you to opt in through eBay. Everyone has access to opt in to use these business policies. Here is a link to opt in to the business policies: http://www.bizpolicy.ebay.com/businesspolicy/policyoptin
*Note from eBay representative: This link to opt in to business policies works about 80% of the time.*