Hi Franck,
Ideas currently does't have this functinality in the file manager. In the other Touch apps, such as Collage or PS Touch, you click (or touch) on the text bellow the file tumbnail and you can edit the name. The only way that you can change the file name in the application is by uploading the file to Creative.Adobe.com, and if it happens to be a duplicate, a message will apear that will ask you if you want to change the name of that duplicate file.
You can also change the name of your file on Creative.Adobe.com. This can be done by selecting the file you'd like to change in your "My Files" folder, and clicking on the title of the file. This will bring up a text edit field that allows you to change the name of your file.
Sorry that this doesn't completely answer your question. If you'd like to see this feature in future updates to the application, feel free to leave a suggestion in the Ideas section of the forum. You may find that other users will vote on this too, and our engineers check this out frequently for suggestions for improvement.
Hope this helps,
Tyler G.
