ReturnDismiss is a free Cydia tweak for jailbroken iOS devices that allows users to dismiss the Keyboard just by pressing the return key on device.
Some times its quite annoying for users when keyboard popup automatically with application on iOS devices, so in that case ReturnDismiss help to take a quick action to make it disappear.
To download ReturnDismiss go to the BigBoss repo and install it, and no further configurations required to use it.