Here's what you should do
The first and usually only step is to download all your transactions from Fatbtc and upload them into Koinly. There are a couple of ways you can do that:
- Fatbtc does not offer any API, so you will need to download your CSV files from their website and import them into Koinly manually.
- If the above method(s) is 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 need to make sure to import your deposits/withdrawals and trades for ALL previous years - 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 show up as Income on your final cryptocurrency tax forms!