Please visit https://developers.cardano.org/en/testnets/cardano/get-started/wallet/ to download the latest version of Daedalus wallet for the Cardano testnet. This wallet is for testing purposes only. It may not be fully-featured and may contain bugs. Please note, Daedalus does NOT have a mobile application.
For feedback or support, please be sure to submit a ticket to the IOHK support team from the Help menu in Daedalus, or by using the submit a request form.