Beex connects to Binance servers via API - two generated strings that lets Beex make orders for you.
In order to create your API, follow steps in this guide.
Please remember that Beex needs only "Reading" and "Spot And Margin Trading" permissions. No other.
Once you have created the API, simply paste the key and secret key into Beex accordingly.
Note that your API keys are stored locally (on your machine) and can't be viewed by administration of Beex.