Here's what you need to do
The first and usually only step is to download all your transaction data from QTUM and upload them to Koinly via CSV file.
Note that if you decide to use CSV files, you have 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 keep in mind is to tag your airdrops/forks so they show up as Income on your final cryptocurrency tax reports!