The first step is to download all your transactions from openledger dex and upload it into Koinly. There are a few ways you can do this:
If you decide to use CSV files, you have to make sure to import your deposits/withdrawals and trades for ALL previous years !
That's pretty much it. The only other thing to be vary of is to tag your airdrops/forks so they show up as Income on your final cryptocurrency tax documents!