Go to Bittrex
Log in or create a new account on https://global.bittrex.com/home/markets.
Open account dashboard
Click "My Account" on the top right corner.
Follow to API
Click "API Keys" on the left side menu.
You must enable 2FA to add API keys. If you see this message, please follow Bittrex's instructions.
Click "Add new key..."
Select permissions and click on the Save button
Choose the permissions as per the screenshot:
Enter 2FA code
Add Bittrex to 3Commas
Use the keys provided as on the screenshot above to connect the exchange to 3Commas. This article will help you do that: