Your eBay Shipping Policy specifies shipping details for your eBay items. Using a Flat Shipping Rule for listings created by the plug-in is optional. Leave the configuration blank if you do not wish to apply a Flat Shipping Rule.
Set up your Shipping Polices on eBay's site. Once logged into eBay, select Account Settings from the drop-down beside your name in the upper-right corner of the page. Then click the Business Policies link. Select Create then select Shippping. Create and save the Shipping policy.
The plug-in current only supports Flat Shipping so you should only select a Flat Shipping Rule from your Shipping Policies.
When the list of policies is displayed, click the title of Shipping Policy that you wish to use for the listings you create using the plug-in. When the edit page is displayed, the Flat Shipping Rule Profile ID will be displayed in your browser's address bar. Look for "profileId=xxxxxxxxxxxx" in the URL. The number is the Flat Shipping Rule Profile ID to enter into the Configuration Options of the plug-in.