Go to Settings > Extensions and click the
INSTALL button on the
AWS Lambda Function Extension. A Drawer similar to the picture below will pop up.
You will need an
Access Key ID and
Secret access key in-order to enable this Extension. Please refer to this doc to create
a new key if you do not have any. Now click
Save button below to Enable the Extension. It will how a Success Message if properly enabled, and your aws key is valid
otherwise you will get an error message.