Paypal Donation Setup

I setup a form using paypal as payment gateway, I was directed to use a donations mode to get the inventory widget working, but now the problem is that the message the user gets says thank you for your donation ... how do I change that to a custom text?

https://form.jotform.com/53235548714963?

You can change that in the Custom Thank You page, settings.

please read more info about it here:

http://www.jotform.com/help/211-Setting-Up-the-Thank-You-Page