how to hyperlink to a secure page

Hi, I am trying to set up a hyperlink on this page of my wp site: https://beyoungessentialoils.com/get-oils-at-wholesale/.

I would like to hyperlink a portion of that page to this secure page:

https://extranet.securefreedom.com/BeYoungEssentialOils/signup/EnrollNew_Info.asp?ReturnURL=&Products=

Do I need to somehow code the link so it goes to the right page. Because the secure link URL does not seem to be complete. It works for a few hours after I set it up. Then the link does not work any more. It goes to an entirely different page, as if I have logged out of the secure site.

Hope this makes sense.