This articles details the places you can find your API key.
Option 1 - From the dashboard overview page
You must be logged in to access the dashboard overview page. From the overview screen your API key is located in the 'Account Details' section.
Option 2 - From the Account details page
Your API key is also located in the Account Details section. You can access the Account Details section by selecting the Account tab in the menu on the left-hand side.
To copy it, simply click the icon to the right or highlight the text manually.