How to troubleshoot web errors on the Apple developer forum? I have an AppleID and paid $99 dollars to enroll in the iOS Developer program. I tried creating new thread in iOS Developer Forum but end up in blank white screen. I couldn't see anything on the screen. 

Has anyone a suggestion on what the requirements (or how to troubleshoot) the developer forum web page when you run into issues?
Usually things like that are caused by browser extensions or an odd interaction between a specific browser version and the code on the site.

Have you looked over the basic support page for the Developer Forums?

https://developer.apple.com/support/resources/developer-forums.html

It has a "contact us" form if you can't solve this by ensuring an up to date (and unmodified) version of Safari isn't rendering the web site properly for you.