When adding a ThingSpeak widget on your screen, a configuration window will pop up, enter the ThingSpeak channel number and press Ok. You're done with configuring.
The widget will update automatically every 30 minutes, if you want to refresh manually, click the refresh icon.
If you want to change the channel of an existing widget, click on the channel name.
This is a widget -- there is no app to open. You must add the widget to your android desktop to see it in action. That said, it is a very basic widget that only supports public channels and only displays plain numeric values.
Nothing to open, no icon, just uninstall
There is no app tot open. I only have the option to uninstall.