Question Cannot leave comments.

Redirect to your homepage or to either one of those menu-items
 
And you should hide your menu-item on the tab Link type
 
And remove Redirection Login Module

== Posts moved to the current topic ==

The easiest way, as @Pinkeltje has already suggested, is to disable the Discuss login.

Use these Discuss settings:
1. Create Topic on first visit
2. Show login button for public users = No

If you now go to this article as a guest, the discussion will be created automatically (if it has not already been created).
Now you have 2 buttons bellow to the article (see picture 1). If you click on one of them, you will be directed to this discussion in the forum.
Log in via the Kunena login (image 2) and you can reply directly.
.
 
.
 
.
 

Please see this video. I'm not sure how to do a redirect so that when someone wants to make a comment, they get a space to type their comment. Is there a instruction manual on how to do this? See video below:

billcory-pictures.s3.us-west-2.amazonaws...rect-loginmodule.mp4

Hiding the menu item.

billcory-pictures.s3.us-west-2.amazonaws...ct%26noshowlogin.mp4

I don't know why you are not being redirected to the forum when you disable the Discuss login and click the button 'Posts in discussion'.
.

I'm not sure how to do a redirect so that when someone wants to make a comment, they get a space to type their comment.

You can disable the redirect plugin again, you don't need it for this redirect.
It won't work the way you want it to, unless your Joomla articles are all in the same category.
You can only create a single redirection with the user login. This means that if you create a redirect to a category in which the article is located, you would have the comment field.

But the redirection will always go to this one category.
Example:
If you create a redirect to Joomla category 1, you will always be redirected to category 1, even if you click the login button for an article in category 2. So you have to go back to category 2 manually if you want to comment an article in category 2.

Possibilities to create a redirection:
Redirect to a menu item.
Click on ‘Select’, a window opens and select a menu item e.g. Home
Then you will always land on Home when you log in via Discuss (image 1) Or you create a Category list menu item and redirect the login via discuss to this menu item. But then you still have to navigate to the correct category first.
.
 
.
.
.
Redirect to a category.
Enter the URL to the category which contain the articles (instead 8 your category ID). Then you will always end up in this one category (image 2).
.
 

First make sure your Kunena menu works and delete those menu-items from your main menu
 
www.kunena.org/docs/en/troubleshooting/menu-issues
Then make a redirect to your forum by chosing your Kunena menu-item in the field Menu Item Login Redirect (your alias will be different from my screenshot)