The first step is to download all your transaction data from BitMax and import them into Koinly. There are a few ways you can do this:
Note that if you decide 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!
Bitmax has now rebranded to Ascendex.
That's all you have to do. Don't forget to tag your airdrops/forks so they appear as Income on your final crypto tax reports!