The first step is to download all your data from instant Bitex and upload them into Koinly. There are a couple of ways you can do this:
If you decide to use CSV files, you must 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 show up as Income on your generated crypto tax documents!