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You will need to follow this link to log into your RunSignup account, https://runsignup.com/Profile
In your Upcoming Events find the Why Not Tri and select "Manage Registration".
You will be brought to your Why Not Tri Registration information page. Here you will select "Add-Ons" in the above menu bar.
You will then be brought to the 'Add-On' management screen, and here you can purchase more add-ons. Once you have selected which add-ons you would like to purchase you will scroll to the bottom of the page and select 'Continue'.
You will then be brought to the payment screen where you will enter your payment information to complete the process!