First, you will need to format your SDcard as Internal Storage.
You can follow this article if you do not know how to format your SDcard as internal storage.
Now, to move the application, just press the menu button on the remote while you are on the Home Screen.
A menu will open on the left, and from here select More,
Now go to Apps
Select the App you desire to move.
Now press the ok button to open the application menu and select Storage Used.
Now you just need to select SDcard.
The app will start moving to the SDcard.
Note that not all the applications will have this option, and that said, they cannot be moved.
Also after they are moved, there is a chance that the application extra content will be erased and you might have to download that content again, this time to the SDcard.
After this, you will be able to run applications from the SDcard.
Note that some applications may have a decrease in performance when running from the SDcard.