You'll need to get your public address for each blockchain you interact with using Bifrost Wallet - for example ETH, SGB and XRP. The instructions will be similar for each.
Bifrost Wallet doesn't offer a CSV export function just yet. However, you can get a CSV file of your Bifrost Wallet transaction history from many blockchain explorers which you can then upload to Koinly. Once you've got your CSV file, here's how to upload it.
Something looking strange with your Bifrost Wallet data import? Not to worry, we've got plenty of help available: