Support Forum

Hi--

I am not a developer, just a frustrated user.  I have been trying to add a forum to my WP site for two weeks for a class I am teaching.  It installed correctly and even worked the first day.  But when I checked it the next day none of the links took me to the topics or allowed me to browse the forum, it just said "Error 404".  I read some of the support posts and thought maybe it was the custom theme I had so I chose a general WP theme, hoping that would help, but it didn't. 

I have set all of the permissions so that isn't the problem because even if you aren't logged in you should see the topics.  Guest are allowed to read.  So I am stumped, probably due to my lack of knowledge.  

Here is the link to the page where my forum is.http://biblioease.com/aspencat.....ses/forum/

I am operating from a home office on a PC and using Chrome.  Already checked it on IE, so that's not the issue (have that problem with some other programs I use). 

I am already a week into the class so I really need to figure this out fast!

Thanks in advance for any help!