The first - and in most cases the only - step is to download all your transaction data from dsx and upload it to Koinly. There are a few ways you can do this:
Note that if you want to import 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 it. The only other thing to be vary of is to tag your airdrops/forks so they appear as Income on your final crypto tax forms!