Which add-on to do this?

If you could post a screenshot in english as to what you mean then maybe you might get more replies. That was in french and not everyone speaks it.

My french is rusty and in any case I'm not sure what you are asking. Are you looking for something that will allow a user to request a name change?

Yes = https://xenforo.com/community/resources/user-essentials-enhanced-version.2142/

No, I want the same so a possibility to have tabs like on the print screen and have the same introduction of course customized by myself but I don't think it is only CSS?
 
Something like this maybe? [tabs] bbcode
This addon adds a [tabs] BBCode that you can use in any post to add tabbed content.
This is useful for posts that have rules, details, or rather lots and lots of content and you are looking to have that organized.
 
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