On the iphone 4, how to get back the circle square thing?

On my iphone 4, when I purchased it, came with the background and an additional circle inside of a square symbol. I had never used it and I had disabled it in the settings. Now since dropping my phone on concrete, The power button does not work and to get it to lock the screen, I either have to shut my phone down or wait a few minutes for the phone to lock itself. I want to get the circle square symbol back on my phone but I can't seem to find it in the settings. Does anyone know how to enable it and guide me through it?

Alright! So:

You Want To Go To:

Settings
General
Accessibility - Scroll Down Until You See Something Called "AssistiveTouch"
Turn It On-

Hope That's What You're Looking For!

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