Solved Forum admin button has dissapeared

Hello
In fact, when i log to the forum, I can't see no button to acceed to the admin panel (see this link to an image of my actual forum ). I'm sure my pseudo is the (only) one defined as administrator and, few months ago, I acceeded to this panel. I just remember the link was obvious, same as all forums ...
But now, I see no link to the admin panel. The only thing I can do seem to be a moderation of members , but I don't know how to create or modify topics (well, the admin panel)

So, is there someone who could guess what is happening and how to I can acceed to the panel ?

PS Sorry for my bad english

In fact, when i log in, I can't see no button to acceed to the admin panel.

What do you mean with admin panel? There is no button for this. If you want go in your administration, then add the word "administrator" on your web address.

I'm not talking about joomla/my website administrator. This, I acceed.
I'm talking about kunena/forum admin. Where you decide the name of the topics, for example

Sorry for my bad english once again

EDIT I changed the name of the topic.

What exactly you want change? Please create a screenshot and mark it.

Well , I would like to edit and add main topics of the forum.

As you can see in my first message screenshot, my forum has three stages : Bienvenues (wellcome), Règles du jeu (rules of game) and "le site" (the website). And I 'd like to change it... add one stage and change the name of the second.
To do so, I have to reach the forum admin panel ... don't I ?

So, how can I do This ?

For this option there is no button. The name of category you can change in "Backend > Kunena > Category Manager > click on the Category which you want edit".
Please see also this doc: www.kunena.org/docs/Simple_forum_setup_instructions

OKKKK ! Everything's getting clear.

Big thanks for your help