Amazon's Kindle Fire does not natively support the Google Play store (formerly Android Market). In order to install Mobicip on Kindle Fire, you will need to sideload it. It can be accomplished in 3 steps.
Tap the Settings icon at the top right of the screen. Select More > Device. Find and set Allow installation of applications from unknown sources to ON.
Open the browser and visit this URL (http://bit.ly/mobicip-android-betaRC4). This will download the apk file into your downloads folder. Touch the top left of your screen to access the downloaded file.
Touch the Mobicip APK file and install it. If successful, you should see the Mobicip icon on your Apps screen.