I would like to add a note for the users before they can post a topic or reply. Some simple directions.  

Hi @doktorek , 

I looked at your attached screenshot above, and thought I'd type out  a suggestion you can try. 

Have you tried the wpForo's "Phrases" functionality?  It's awesome and highly customizable.  For your use case, maybe you can also try to edit the "Topic Title" and add your text there?   Just go to... 

1) Forum Dashboard
2) Phrases
3) On the "Front-end Phrases" Search box, type "Topic Title" 
4) Under the Phrase key, hover your mouse, so the Edit appears
5) Then on the Phrase Key, you wish to edit, in this example "Topic Title" , delete the Phrase key and just change it to "Topic Title (ideally, with maximum of 50 characters)" (as an example)
6) Then save.

You can do the same process for "Attach File" and "Topic Tags" 

Might be a workaround. (I did that for my forum to remind members to be mindful of the length of their topics) :-) 

Good luck and God bless you!  :-) 

We are sorry, but we can't provide other solutions. The above-mentioned method is the final option that we can provide.

1st. This is for reply box only. What about NEW TOPIC box?

2nd. Also, 1st line you gave me puts it in LARGE CAPS next to  "Leave a REPLY"  text.  I want it below the topic box. Or maybe above attachment box.   Is that possible? 

Please use the following hook:

add_filter('wpforo_reply_form_head', function($t){
   $t .= "
" . 'You text here.';
   return $t;
});
add_action('wpforo_reply_form_extra_after', function (){
   echo "
" . 'You text here.';
});

Please bote the red marked text can be changed.

The hook should be added in the current active theme functions.php file.

What file edits those 2 places?

We're really sorry but there is no way to do it via editing file.

However, I'll just ask developers if they can provide any other solution for you. Please wait a bit. I'll update the topic once I get some news for you.

Sorry for the late response.

If you have something important to say on the front page, you can use the "Admin Note".

The option is located in the Dashboard > Forums > Settings > Misk admin page.

Also, I'll suggest you check the wpForo – Topics Custom Fields addon. The add-on allows you to add and manage custom fields in your forum topics.

More info here: https://gvectors.com/product/wpforo-topic-custom-fields/

What file can I edit (i guess on the server) to add that extra text.  I included a screenshot where I want the text. I just dont knwo what file on the server has edit for that. 

https://prnt.sc/uc3s9v

https://prnt.sc/uc3sil