Step 1:
Login To Your Poloniex Account

Step 2:
Select "My Trade History & Analysis" from the Orders drop down

Step 3:
Click "Complete Trade History" to download your history

DO NOT open the file in Excel and "save as" a new file.  

It's important to upload the raw file that Poloniex exports straight from your "Downloads" folder. This avoids rounding errors and corrupting the file.

Step 4:
Upload your trade history file into the Poloniex tab on Step 2 (Import Trades) and click the Import Trades button.

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