The first and usually the only step is to download all your transactions from Coinapult and import them to Koinly. There are a few ways you can do this:
If you want to import CSV files, you must make sure to import your deposits/withdrawals and trades for ALL years !
That's pretty much it. The only other thing to be vary of is to tag your airdrops/forks so they appear as Income on your generated crypto tax forms!