SMS Message Notification

Hi, i’m a newbie user of your plugin. It’s working well but the message is still “Thanks for testing clickatell’s gateway coverage”. Can you please help me where can i change the content of my message? It’s kinda weird because the setting is in default mode and it’s fine but still that message shows like that.

https://ww.wp.xz.cn/plugins/order-sms-notification-woocommerce/