IPhone 3GS ios 6.0 jailbreak, can't purchase anything?

Today I decided to jailbreak my iPhone 3GS to purchase gems, treats, and coins on Dragonvale. After doing everything I was informed to do I went onto the app to finally buy things, as soon as I clicked on anything to buy it the app closes.

You don't get free paid apps from the app store, you have to install an app called installous from cydia.
to install installous, you have to follow these steps:

1- Open Cydia
2- Go to Manage -> Sources -> Edit -> Add
3- Put this URL (http://cydia.hackulo.us/) without the brackets
5- press "add source"
6- Once you have added this source tap on it and Search for Installous and select the Installous 5.
7- Now hit "Install" on the right corner then "Confirm" button to install Installous 5 after installing finished you will be informed by a message to Restart SpringBoard to reboot your device.

Then you'll find the installous app in your home screen, open it and download whatever apps you want.