I've reported the issue to the Forum Provider (Social Strata).
Debbie tested both her iPhone (an Apple device) and her laptop (Windows 10) both loaded the forums with no trouble. To navigate to the forums Debbie navigated first to the website and then used the link on the website home page.
The address of the website is panterainternational.org
Panteracars.com is no longer supported, it won't forward (re-direct) you to the correct address.
PANTERA INTERNATIONAL
A DE TOMASO CAR CLUB
Presents the De Tomaso Forums
The On-Line Meeting Place for De Tomaso Owners and Enthusiasts From Around the World
Clicking on the banner will take you to the sponsor's website.