I've logged in the last few times to the forum with Safari on the latest High sierra updates. It has been telling me the website is not secure. This is true as there is no TLS https certificate for the forum. I can also confirm that my iPhone is saying that the forum isn't a secure connection running the iOS 12 beta but i also saw this on the previous versions of iOS 11. .
The strange thing is if i manually type in "https://" to the URL it will reload the page and not complain. However, the URL never changes to show "https://forum.audiogames.net." It still shows "forum.audiogames.net" no matter what I type in.
If the forum and audiogames.net doesn't have an https cert, there is Lets encrypt for providing free certs if paying for a cert is out of the question. Additionally, if the forum is already https, please let the https show in the url and offer to use https for all connections by default.