Before you can install AppAddict 3 beta there are a few requirements:
Your device must be JailBroken, have AppSync installed and running iOS 6.x.x or iOS 7.x.x

Running old iOS 5? Try out AA legacy app
Not jailbroken? Try out AA resigning app

How to install appsync?

Once your device is JailBroken you will also require a package called AppSync this enables you to install our app along with any other cracked app. To add AppSync to your device please add the following repo to Cydia:
cydia.appaddict.org

Next install package contained into it.

Screenshots below show how to add our repo to Cydia and install AppSync for all you virgin JailBreaker’s:

Last step - slide to install AppAddict app

Slide to install