Hey there, @mollfamily317. Happy to shed some light on your question.
When signing up for a new subscription to QuickBooks Online, you'll have two choices: a free trial or 50% off for 3 months. Since you chose the free trial option, the discount won't apply to your subscription. In order to get that discount, you'd need to have signed up for the promotion initially.
You can find out more information on our Pricing Page.
Let me know if you have any other questions. I'm here as your number one resource for QuickBooks Online. Have a safe weekend!