Offload lite not allowing me to select DigitalOcean

I recently installed Offload Lite with the intention of starting a stock photo site – I then set up a DigitalOcean account and copied my keys to the wp-config.php file. But when I logged in again it ha defaulted to Amazon S3 – a message in the righthand corner next to Amazon S3 displays as ‘defined in wp-config.php’ and I cannot change the selection to any of the other options. Help!