First, navigate to the campaign where you'd like to connect the Amazon Ads integration, then click "Integrations" from the menu on the left side of the screen.

Next, either search Amazon Ads in the upper right search box, or click the Ads category, then click Amazon Ads.

Then click "Connect Account".

Amazon requires you to specify your account's region. Do so via the "Region" drop-down menu, then click "Continue".

A popup will appear asking you to sign in to your Amazon account. Enter your credentials, and click "Sign-In".

Next, click through to select the exact account to integrate, and click "Continue".

Note that if you see "0 Accounts" after signing in via the Amazon popup, it's likely that you've specified the wrong region. Double-check your account's region, and repeat the integration process.
​

Note that Amazon allows access to a maximum of 60 days of historical data. Due to this, you cannot view data older than 60 days from the date of integration.