The first step is to download all your data from liqui.io and upload it to Koinly. There are a couple of ways you can do this:
If you want to import CSV files, you have 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. Don't forget to tag your airdrops/forks so they appear as Income on your final cryptocurrency tax documents!