The first and usually only step is to download all your data from Xapo Wallet and upload it into Koinly. There are a couple of ways you can do that:
Note that if you want to import CSV files, you must make sure to import your deposits/withdrawals and trades for ALL previous years !
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!