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Now that we have our access keys and created an S3 bucket you can head on over to your AdminCP and navigate to Apps > Amazon CDN
The settings you are required to fill out are Specify Amazon Key ID, Amazon Secret Key & Bucket Name. and Amazon Secret Key which you just obtained in the first 2 fields >> Save Changes.
Select Manage, choose an existing bucket or create new bucket and Save.
Next go back to Settings, you will see all the fields are filled with proper information for you. Please do not change values in Bucket Region & Bucket Name.
Once you have filled out those settings you can click Yes for Enable CDN.
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and Save Changes to save all settings.