The third Daedalus release for the Shelley testnet adds delegation features, including Delegation center, stake pools, and rewards. Shelley testnet users can now create Shelley wallets, fund them using the Shelley testnet Faucet, and delegate stake from their wallets to a stake pool of their choice. This will enable users to experience earning testnet ada rewards before this feature becomes available on the Cardano mainnet, when Shelley goes live later this summer.
Please read the release notes for more information.