Here's what you should do
The first step is to download all your transactions from FEX and upload it into Koinly. There are a couple of ways you can do that:
- FEX does not have an API, so you will need to download your transaction files from their web UI and upload them to Koinly yourself.
- If you only have a few transactions and the above method(s) are not possible for you, you can even add the transactions one by one via Koinly's web interface.
If you decide to import CSV files, you have to make sure to import your deposits/withdrawals and trades for ALL previous years and not just the current one!
That's all you have to do. The only other thing to keep in mind is to tag your airdrops/forks so they appear as Income on your final cryptocurrency tax reports!