There are three different methods that you can use to relate your Opportunities to campaigns or record types.
Method 1. Add the ID’s onto the URL of the “Donate” button or link which hosts the embedded Aura form.
Method 2. Add the ID’s onto the end of the Salesforce Site within Aura Setup while creating the Aura form. If using Aura Connect for Facebook, we recommend using this option.
Method 3. Add the ID’s onto the end of a URL, such as included within an email blast, or online post.
Full instructions for all three methods are found on page 28-29 of the Brickwork Installation Guide.