In order to activate Infobip notifications you need to go under Settings -> Modules -> Notification Modules. Then, you have to click 'Activate' tab next to Infobip notifications module. To configure the activated module, you ought to go under Settings -> Modules -> Notification Modules -> [MODULE] -> Edit Configuration.
Configuring module
Sign in to Infobip.
Infobip will send you activation email. After activating your account you will receive as email a username and password.
In "Infobip" module configuration in HostBill enter your username, password and optionally from whom message was sent. "From whom" can have a maximum of 11 characters.