The first and usually the only step is to download all your transaction data from coinvault and upload them to Koinly. There are a couple of ways you can do that:
If you decide to use CSV files, you have to make sure to import your deposits/withdrawals and trades for ALL years and not just the current one!
That's all you have to do. Don't forget to tag your airdrops/forks so they show up as Income on your generated cryptocurrency tax forms!