Support page not secure?
It’s a bug that some portion of the forum users encounter. You can access the Support website page via the ‘Support’ link found on any other guildwars2.com page, such as ‘Releases’, ‘Wiki’, ‘Media’, ‘Guildwars2.com’, etc. All links found above.
Good luck.
It’s an outdated URL that they’re unable to change because these forums can’t be modified. Your browser blocks it because the security certificate isn’t valid for that URL. The actual link is https://help.guildwars2.com. This won’t matter for much longer however, since they’re working on new forums.