How do I turn on my VPN?

I have been opening and closing my VPN(different website), but now it won't let me do it. I did what it said to get started and then it tells me to open in the open site. Where do I find the open side? I used to press the VPN shortcut in the upper right corner and it usually worked. Now it just asks me to "Try firefox VPN. I thought that is the one I was using. How do I get it going again.