Step 1:
Open up and login to the Celsius app.
Step 2:
Tab on "Total Wallet Balance"
Step 3:
Scroll down until you see the "See All" link and tap on it.
Step 4:
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).
Step 5:
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.