The first step is to download all your transaction data from Bitinka and import it to Koinly. There are a few ways you can do that:
Note that if you want to import CSV files, you must make sure to import your deposits/withdrawals and trades for ALL previous years !
That's pretty much it. The only other thing to keep in mind is to tag your airdrops/forks so they show up as Income on your generated cryptocurrency tax forms!