We suggest that you first reboot your mobile device, to re-establish an Internet connection.
To delete the app from your device:
Tap and hold the Storm Shield app icon until it wiggles
Then tap the "X" that appears on the icon; the app icon should disappear.
After deleting the app, power off your device and reboot it.
Then go back to the Apple App Store and search for "Storm Shield", re-download the app, and install it again (there will be no charge for this.)