Finding your API Key
Once logged in, click on your name in the upper right hand corner, then click My Account. Scroll to the bottom of the page, and click the Show button to reveal your API key. You can then select the key and copy it into your clipboard.
API Access in your account page.
Resetting your API Key
In the lower right hand corner you will find the red Reset API Key button. This is useful if your website has been hacked or if your key has otherwise been compromised. After clicking the button to reset your key, there will be a confirmation dialog. After you accept, the new key will appear. The old key is immediately destroyed and you will need to update all your programs and services with the new key.