1. Upload your game rules in Documents > Multimedia library
The first step is to upload your rules in the Manager's library. Once the file is uploaded, View it and copy its URL.
2. Create your opt-in in the Opt-in Manager
The second step is to create your opt-in. In order to do that, go to the Opt-in Manager. You will have access to all the editing options you need. When you create your new opt-in, you should insert the link your previously copied.
3. Add the opt-in you just created to your campaign's form
Go to your campaign, in the Form step. Under the main fields options, open the Opt-ins section. All you have to do now is tick the opt-in you just created so it will be added to your form!