Gravity Form Linked to Sandbox

Hi guys,

I’m not the original developer of this WordPress site, so I’m going in to fix things that someone else initially set up. My problem is a Gravity donation form that is taking people to a sandbox PayPal account. It’s not letting them log in, and I just figured out the problem is likely the sandbox instead of a live account. I can’t for the life of me figure out how to fix this. In the PayPal settings, I changed the mode from “test” to “production” but it’s still taking people to the sandbox. Anyone know where to go and fix this? I’ve been googling for an hour with no luck. I realize this is 3rd party, but I don’t know if the settings are in WordPress, the Gravity plugin, or in PayPal. Any help is appreciated.

The page I need help with: [log in to see the link]