Hi, I found how to resolve my wishes like that. I have edited the template of the portal of yunohost
$ sudo nano /usr/share/ssowat/portal/login.html
where I add this lines at the beginning
<div class="container"> <h2 style="text-align: center; background-color: #fff"><a href="https://www.mydomain.tld">Cliquez-moi pour visiter le site Rodinux !</a></h2> </div>
