Thank you page from template is going to a random webpage despite which option i select

Hi, I've used one your templates but when I test and submit the form at the end it's going to an external website that I can't appear to change? all I want is "Thank you for submitting" not an external page.

If you could help I'd appreciate it

Your form is redirecting the users to "http://www.tradestartupacademy.com"
Please change your thank you page setting from "Redirect to external link" to "Show a thank you page".