Automatic WordPress Backup ERROR

I did sign up for an account, I got the credentials it asked me. I tried to get a “create a bucket:” but does not let me, it gives me this error:

Warning: S3::listBuckets(): [NotSignedUp] Your account is not signed up for the S3 service. You must sign up before you can use S3. in /home/website/public_html/wp-content/plugins/automatic-wordpress-backup/S3.php on line 87

Warning: Cannot modify header information – headers already sent by (output started at /home/website/public_html/wp-content/plugins/automatic-wordpress-backup/S3.php:87) in /home/website/public_html/wp-includes/pluggable.php on line 897

What do I do? Please and thank you