Not all browsers operate the same way, so what works for me won't necessarily work for you. But I click in the address bar to select it, then hit the left arrow key on my keyboard. Then just navigate to the 's' in https, delete it and hit enter.
Or if your browsers address bar doesn't show the http at all, just navigate to the left of the www..., then type in http:// to add to what is there already, then hit enter.
Probably won't work after all that, lol.
If that doesn't work, try logging out.