ZenLedger will take in a receiving address from your Trezor wallet.
Once you have your addresses, go to the Wallet input section in ZenLedger. 

Here is how you find the receiving address for a coin on your Trezor wallet.
https://wiki.trezor.io/User_manual:Receiving_payments

CSV
You can download your Trezor CSV and upload to ZenLedger.

Log into your Trezor Online Wallet (https://wallet.trezor.io)
Click on 'Transactions' on the top
Download the CSV file and upload it here

Then in ZenLedger, go to Dashboards, Exchanges, then scroll down to Trezor and click on "CSV" to chose the file to upload.

XPUB

If you have many different wallet addresses for one coin, like BTC, BCH, LTC, or Dash, you can grab your Trezor xpub addresses here:
https://wiki.trezor.io/User_manual:Displaying_account_public_key_(XPUB)

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