Go to the item page of your web application. You should see a "Configure" button. You will then be able to specify a URL to an image to display as a logo over the map.
Thanks a lot for your reply, but i don't know if I do well. surely not because I don't see the logo on the map.
After a clic on the "modifier" button ("configurate" (the button with a pen ?)), I have filled the two localisations where I can put a url image (in french "Description" and "Contraintes d�??accès et d�??utilisation") (see the image attached).
> No logo appears in the description or on the map!
Are you the owner of the web application? If not, you'll only be able to open it. Not all web application templates are configurable. I assumed you were using the same template as the application you took a snapshot of, which is configurable. When you create a template, the configurable ones have a little gear icon displayed over the thumbnail (see attached image). I'm guessing you're using one that can't be configured.
I understand this notion of configurable model or not and I have chosen a configurate one "Visionneuse de base"
It's the same for all my old maps whitch I have insert a logo (see the link below for exemple), I can't see the configurate button and today I can't change this logo????