That depends on what option you chose for the config storage: Hostpath or iXVolume.
If you chose iXVolume then the emby config folder is stored in a hidden dataset called .ix-apps which is located on the apps pool you chose when you first opened the apps page.
If you chose hostpath its located in the dataset you chose for your config folder.
We need a bit more information on the setup to give accurate advice…
Those Menu tiles on the right should appear if you click on e.g. emby or plex, at least they do for my apps… The screen should be the same for 25.04 and 25.10
I’ve gone into the shell and then into the config folder. there is a password.txt file I want to look at, but how because what I use in linux doesn’t work in truenas.