Hi Ather,
Using an ADK is just like any other key, so there is no difference in the decryption methodology.
The biggest thing is that you have the keypair to be able to perform the decryption as well as the passphrase.
Once you have both of those critical components, you are good to go.
The thing about decryption is you need to be careful about where to store that decrypted content when you are finished as it will then be in the clear, so I only recommend decrypting content if needed.
Hope that helps!