You can learn how to add a Key Party to a Compliance Profile by clicking on this interactive demonstration. You can also follow the below steps: 

1. In the Salesforce dashboard, click on the Compliance tab 
2. You will be taken to your list of profiles. Click on your selected profile 
3. To add a Key Party within the profile, click on Add Key Party in the top right corner 
4. Use the drop-down to select whether the Key Party is a business or an individual
5. Populate your Key Party data
6. Click the blue Confirm button 
7. The Key Party has now been added