This modal window – one of many in the AWS management console – allows you to create a bucket. Creating a bucket means typing in a name and choosing a region.
Each bucket needs a unique label used to access the objects. That’s unique across the entire AWS S3 service, not just unique to you.
You are here (in terms of web breadcrumbs): Amazon Web Services > Storage & Content Delivery > S3 Scalable Storage in the Cloud > Buckets > Create Bucket.