Solved How do I get the category view to show more than one post at a time?

A quick diagnosis:
There are still Kunena menu items in the main menu. I had written to you in the other topic: Links from other menus that are linked to the forum must be Menu Item Type = Menu Item Alias. Menu Issues
You have a lot of menu items in the trash, these can also lead to errors. Delete the menu items from the trash.
The redirect plugins are enabled.
In the category settings you have the first section set to Public, but the associated category is only available to the superuser.
The second section allows access for registered users, but the associated category is available for public. This also makes no sense. Either both for registered users only, or both for public.
When logged in, I can't see anything in the frontend because the login module redirects to the profile setting and I can't get away from this page because I'm always redirected back there.
Incidentally, I have noticed that you have 13 superusers. Is that ok for you?
To find the error, I would have to remove all menu items, deactivate all extensions and scripts and start again. Unfortunately, this would take too much time. I'm sorry

I have tried my best to apply everything you have suggested I do there are no main menu forms linked to the forum I have used the menu creation tool to recreate the forum menus and I get this error not sure if it means anything:

danger
Joomla\CMS\Table\MenuType: :delete failed - Some menu items or some menu modules related to this menutype are checked out by another user or the default menu item is in this menu.

You can make any changes you wish to get the forum working on forum.BiiC.co.za I have set up super user access in private message and I have logged in using it and pre accepted the privacy acceptance so that you won't be forced to view profile when you login.

Main issues posts are not selectable as it runs into a timeout if you select a post to view.
I have set all the blog categories to "Forum" access level not quite sure what the difference is between access level and access group setting on Kunena permissions maybe that might be the issue??
I just realy need to get this forum working urgently Please help.

Perhaps a configuration report could help.
docs.kunena.org/en/faq/configuration-report
 

I have placed it into the Private message area.

Should work so far. I have updated Joomla, installed Kunena over it again, redirect plugins disabled and disabled SEO settings.
Rename your htaccess.txt to .htaccess (the dot at the beginning is important), then select in the Joomla global configuration:
Search Engine Friendly URLs = Yes
Use URL Rewriting = Yes
Then test your forum again.
Also check your category settings. If the section is only accessible for superusers and your group named "Forum", the contained category cannot be seen by guests, also if is set to Public.