Open up and login to the Celsius app.
Tab on "Total Wallet Balance"
Scroll down until you see the "See All" link and tap on it.
Tap on the "Send CSV to Email" button and download the csv file that was sent to your email (same email registered to your Celsius account).
Inside of CryptoTrader.Tax, navigate to Step #3 (Other Transactions) and click on the Celsius tab. Once on this tab, upload the csv file you just downloaded.