The first and usually the only step is to download all your transaction data from ProBit Exchange and upload it to Koinly. There are a couple of ways you can do that:
If you decide to use CSV files, you must make sure to import your deposits/withdrawals and trades for ALL years !
That's all you have to do. The only other thing to keep in mind is to tag your airdrops/forks so they show up as Income on your final crypto tax forms!