What is a one-sentence summary of the following article?
Go to https://www.groupon.com/customer_support. Sign into your account if you're not automatically signed in. After logging into your account, select the specific order you need help with and then click “Choose.” Any self-service options available for this specific order will appear, including the options to edit an order, cancel for a refund, trade-in an order for Groupon credit, or return a Goods item. Just click on the option you want. If certain options aren't showing up, like "Cancel Order," it may be because the order isn't eligible. Contact Groupon using the Live Chat, Email, or Callback features to get more information from an agent.

Summary:
Go to the Groupon Customer Support page. Select your order. Review the available options.