You can change your Exchange only if you have the Platinum subscription. You will not be charged any additional fees.
Before proceeding with the following procedure, you must configure the Exchange you wish to use. If you do not add the new Exchange beforehand, then the Switch button will not work.
To do so, here are the steps to follow:
1. Click on See details in the exchange you are using:
2. Go to the License tab:
3. Finally, click on the Switch button where you will be able to change your Exchange.
Here is a tutorial to guide you through the process: