IPhone 4 iOS 7.0.6 jailbreak?

Hey c:
So, my little cousin dropped my iPhone 4 on the concrete. Now there's no sound. So, I reset it and plugged it into iTunes to see if that would work. It had sound only when connected to iTunes. THEN, I went online saw a bunch of comments saying 'jailbreak it' so I did. I downloaded envasi0n7, and when it finished downloading, I jailbroke my phone. There's no Cydia and the envasi0n 7 app is still there. What do I do?

thanks c:,
x Emerald

Added (1). No my screen isn't cracked. It's chipped on the back where it fell but it isn't cracked. Also, my microphone doesn't work anymore.

And I can't run envasi0n 7. It just stays a white screen with two black lines running across it. It takes a few minutes, then it will close and go to my normal home screen.

Run the app to complete the process…

Better take it to Apple, you don't want to damage it more than that, they are probably going to fix it for an extremely expensive price so might as well get a new phone. And may I ask a question? Is your screen cracked as well?