The first - and in most cases, the only - step is to download all your transactions from bit trade and upload it to Koinly. There are a few ways you can do this:
Note that if you decide to use CSV files, you need to make sure to import your deposits/withdrawals and trades for ALL years and not just the current one!
That's all you have to do. The only other thing to be vary of is to tag your airdrops/forks so they appear as Income on your final crypto tax forms!