On your Adopia account page, click My Account

Under My Account Information, in the Billing Info section click View of Update.

Under Opt-In Settings, scroll down to Customize Confirm Page. In the Customize Confirm Page section you can edit the way you'd like your Thank You page 

displayed. You are are able to have your logo and website URL displayed and you can pass whatever user information you'd like to include about the subscriber 

as well.