The first - and in most cases the only - step is to download all your transaction data from Escodex and upload them to Koinly. There are a couple of ways you can do that:
If you want 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 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 reports!