Redirect to Thank you page after an submitting an embedded form

I need to redirect a embedded form to a thank you page. This form is embedded from our invoice software and shoots the form that's filled out directly to the software. I am unable to redirect the page because its embedded and I need to be able to get it to a thank you page for my tracking. Anyone have any advice?

20 minutes ago, domv said:

I need to redirect a embedded form to a thank you page. This form is embedded from our invoice software and shoots the form that's filled out directly to the software. I am unable to redirect the page because its embedded and I need to be able to get it to a thank you page for my tracking. Anyone have any advice?

What is the software? 

Jobber