Go to Binance
Log in or create a new account on https://www.binance.com/.
Follow to API
Hover the profile icon on the top right corner, then click "API Management."
Name your key
When you have multiple APIs, a proper name helps to manage it.
If you already have API keys, create new API will be on top.
Click "Create" then enter 2FA code
You must enable 2FA to add API keys. If you see this dialog, please follow Binance's instructions.
Confirm with email
Open the email from Binance and confirm.
Add Binance to 3Commas
Don't change the key settings.
Check how to connect API to 3Commas.