Your collection consists of the music you’ve paid for on Bandcamp, added via a track/album code provided via a seller, plus the items on your wishlist. So to add music to your collection, buy it, or click the wishlist button on any artist’s site (it’s the heart icon below the cover art).
Please note: If you’ve obtained a release by inputting $0 in the buy dialogue, it will not be added to your collection. Instead, you’ll be required to enter your email address for a download link.
Missing some purchases? Check here for help.