Yes, Anonymous20 is right. This is not wpForo Email. This is WordPress email. You can't customize it from wpForo. New registration emails are being sent by WordPress. Find some plugin to customize WP emails or contact to WP support.

This should be set from the WordPress side. But unfortunately WordPress doesn't have such a setting, however, there should be many plugins for this purpose.

As an alternative solution, you should put this code in the active theme functions.php file. Just change the noreply@example.com and My Website Name values.

add_filter( 'wp_mail_from', function( $name ) {
    return 'noreply@example.com';
});
add_filter( 'wp_mail_from_name', function( $name ) {
    return 'My Website Name';
});

Similar topic: https://wpforo.com/community/how-to-and-troubleshooting-2/user-registration-email-confirmation/

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About your problem: wpForo doesn't actually send any email out. Wordpress does. What you see comes from Wordpress core. You can change it BUT that involves a plugin and i do not dare to suggest one, because it will complicate things for you.

One last question, when the email confirmation is sent it shows from wordpress, can you please direct me where to change that?

Thank you!  I've added the coding but the login is still there. 

There is no longer such issue, Just press CTRL+F5 on frontend before checking. Please watch the video: 

https://www.screencast.com/t/qUQhJolF

Also when members register from the forum page, they are emailed with a link (I did not change any coding) when they click on the link it brings them to my wordpress dashboard so I am getting emails about the confusion.  Where can I find how to fix this?  

Navigate to Dashboard > Forums > Settings > Features set yes value for the "Replace Reset Password Page URL to Forum Reset Password Page URL" option. 

and when guests login, instead of being on the home page for the forums it brings them to the members page

Please navigate to Dashboard > Forums > Settings > Members admin page, remove the  "Redirect after login" fields value.

.mk-header-toolbar { 
    display: none;
}

I still have the double sign in (see attached), if someone uses this login at the top it will log them into wordpress, is there a way to get rid of it?

The problem with the login URL is solved. You'd added an additional slash in  Login URL field of the "Custom Authorization URLs" option thus it stopped work. We've already removed it, now everything is working fine. Please watch the video: 

https://www.screencast.com/t/ETxO2oa5cILZ

Also please let us know about moderation. Is there everything clean in the support topic I've provided?