Question: I accidentally created two of the same address. How can I merge them together?
Answer: To merge addresses: click on Settings, then Addresses. Click View on the address that needs replaced. You will see a button at the top that says "merge address". Type in the address you wish to use instead in the search box next to "replacement address". If the address you're using instead is not already in your address book, click "create replacement address". When finished, click the blue "merge addresses" button.