Use this Analytics Edge wizard to enter your Moz account credentials. Using the Mozscape API requires that you get an Access ID and Secret Key associated with your Moz community login. Get them from here: http://apiwiki.moz.com/create-and-manage-your-account
Note that the name you enter for your account is reference only, and appears in the listing and drop-down selectors in other Analytics Edge wizards, so use a meaningful name.
One of your accounts can be identified as the Default account to use, which makes it easier to build generic queries and template workbooks.