The first step is to download all your transaction data from MBAex and upload it into Koinly. There are a few ways you can do this:
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!
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 final cryptocurrency tax reports!