Hi,
Hum! I don't understand your question ???

(and it's not your English)
... on NAS, Jdownloader is started by root user in ADM boot up (APKG)
... the only user ... is the account user in my.jdownloader ... and password is changed (in org.jdownloader.api.myjdownloader.MyJDownloaderSettings.json) by jd itself through the Web interface in my.jdownloader site ...
When you have multiple jdownloader NAS or PC on the same account, take care to change the name server to be able to identified the correct one (I have for my own 3 JD, 2 NAS and a PC (Ubuntu used as reference for tests), each have a specific name )
NAS users have NO interact with jdownloader ...
If you want to change the user/password (credential for my.jdownloader), as I know due to some encrypted values ... this require to re-init JD with the new credential
re-init :
1 remove then reinstall APKG (your download are preserved (in a separate share) but download running are lost ... so be sure to have ended all.
OR
2 if you have Linux skill, you can try to redo the init.sh provide with the APKG
... in a root terminal (or sudo)
... disable APKG
... cd /usr/local//AppCentral/jdownloader/
... remove .init_done file
... rename jd folder as jd.prev
... create a new jd folder
... cp inside jd.prev/JDownloader.jar jd/
... enable the APKG or run ./init.sh
... this reinstall jdownloader with any new credential define in my.jdownloader
AFTER ... I don't know how you can see in the same windows the 2 JD with different credential ...
Philippe.
NB I don't test it, just changing the password ... but if I don't do some mistake ... it must run.
