Delete Status bar Icon downloaded from web
The app should at least be found in Settings &rarr; Apps &rarr; Manage Apps, where you should be able to uninstall it. Alternatively you can visit the Playstore website, log in with your credentials, go to "My Android Apps", select your device (in case you've got more than one in there), find the app in that list, and remove it by hitting the trashcan-symbol.

If all this fails (the second alternative should not, but who knows), your "last resort" will be a factory-reset of your phone (which will remove all data and all apps you've installed).