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Click the Store link.
Next, select the Promotion Type:
Note: After you choose the Promotion Type, you can provide more specific details about it. For example, you can pick products or categories that are eligible for the promotion, or you can choose minimum or maximum purchase values that qualify for the promotion. Buy something and get something is not available right now in the Promotions Center.
Is this the first promotion you've created? If so, you'll also need to click Publish All in the Store Editor and Publish Order Settings in the Store Manager.