I registered signed up for the sat subject test. how can i add another subject for the same test date?

I only signed up for the us history but i want to do biology and/or math 2 too. i can't find the link on collegboard site that enables me to do that. i only see the test date and location change link. how can i add another subject? and i have a sat fee waiver... do i have to pay for the additional subjects?I registered signed up for the sat subject test. how can i add another subject for the same test date?when you go take the test just do it again youll c what im talking about when u take it

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