The first - and in most cases, the only - step is to download all your transaction data from Buda and upload them to Koinly. There are a couple of ways you can do that:
Note that if you decide to use CSV files, you must 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 appear as Income on your final cryptocurrency tax forms!