AWS credentials are used by CloudKnit to provision your environment on AWS. You can provision an environment on AWS only after setting these credentials.
These credentials can be created & updated using CloudKnit secrets manager, which is accessible by clicking on the Settings Navigation button, as highlighted in the below image.
AWS secrets that need to be set:
Access Key Id
Secret Access Key
There are 3 scopes to which these secrets can be added,
environment. By default, CloudKnit tries to find secrets at environment level, then at team level and lastly at org level.