IMPORTANT: this is a widget, not an application. This means that you have to install it on the desktop. It's completely normal that in the settings page there is only a switch for data connection auto enable.
If you use often the embedded feature of your device that turns it in a WiFi router sharing your data connection (not available on all devices), if your device like mine needs 7 clicks to turn it on, you will surely benefit of this simple widget that enables WiFi Tethering in one click.
From settings pane is possible to enable the function that automatically activates data connection. This functionality however is not supported on all devices.
Remember that data connection can imply extra costs on you mobile plan.
This application is distributed for free without any kind of warranty.
If you find any bug please report.
2.5.1 bug on 4.x should be solved
2.5 reduced icon size
2.1 fixed bug in icon state change
2.0 Added auto data connection enable