Here's how to apply a code to your upgrade:
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Head to Settings > Plans & Billing > Choose the plan that works best for you > Upgrade
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Click "enter promo code"
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Apply your coupon code in the "Promo" submit box.
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Enter your payment details
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Select the "Pay Now" button.
Choose the plan that works best for you and select "Upgrade". A payment page will pop up.
Make sure to click the "enter promo code" and input your coupon code.