Hi @franricht,

I'm worried about viruses, if I accept <iframe> can they get viruses in the forum?

I don't think there will be such a problem. The content can be included by spam ads, videos or something like that. 

Do not add the name of the iframe tag with its attributes.

If you were so kind to tell me how.

I'm sorry, but I don't follow you. Please try to explain in other words. 

I do not know what I have to add here:
In Dashboard> Forums> Tools> "Allow extra HTML tags" textarea you should add iframe tag name with its attributes. This will allow using iframe tag (use the source ({:}) button before passing the link).

It does not work for me
If you tell me what I have to add, I appreciate it because I've tried several things and it does not work for me.

I have tried adding this:
embed (src width height name pluginspage type wmode allowFullScreen allowScriptAccess flashVars), src (iframe), iframe src, src
But it does not work.

Please follow these steps:

1. remove all tag names and attributes, you've added.
2. add this iframe(src width height) in  Dashboard> Forums> Tools> "Allow extra HTML tags" textarea. 
3. delete all  caches (Dashboard > Forums > Dashboard)
4. when you're going to insert the iframe code just click on the source ( {:} )  button. See screenshot:

   

perfect! it works now.
But now I get this bar:

How can I remove that?