This is easy.
If you are submitting your album for the first time:
You will have an option during the album submission process to authorize SoundExchange.
If your album has already been submitted and distributed:
Simply login to your dashboard at Catapult and click on the album in your catalog that you would like to authorize. On the next page, click the "Stores" tab and scroll down to "SoundExchange" and select "Authorize".
Once it's authorized, our system will automatically go out and claim your sound recording's ISRCs in SoundExchange.*
*Please note, if you previously authorized "Future Stores & Platforms" when you submitted your album originally, Catapult may in some circumstances automatically authorize your album's sound recordings for SoundExchange.