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Step 1: You will need to follow this link to log into your RunSignup account, https://runsignup.com/Profile
Step 2: In your Upcoming Events find the Why Not Tri and select "Manage Registration".
Step 3: You will be brought to your Why Not Tri Registration information page. Here you will select "Giveaway" in the above menu bar.
Step 4: You will then be brought to the 'Giveaway' management page. Where using the drop down menu you can adjust the shirt size you selected during registration. Then hit 'Continue' to complete the process.