The first - and in most cases the only - step is to download all your transaction data from Bitkub and import them to Koinly. There are a few ways you can do that:
Note that if you decide to use 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. Don't forget to tag your airdrops/forks so they show up as Income on your final crypto tax forms!