In the top left corner, click Dashboard

Click on the Registration section to expand it

Find and click on the desired registration to open it

At the bottom, click the Edit button next to Contacts

Use the search field to see if the person you want to add is already in the system.   Enter their last name or partial company name, click the green Add button to add them.

If they are not in the system, click “Create Contact” at the top and complete the necessary fields for the person or company.

Click Update when you’re done adding contacts.