I pressed in Firefox "Open torrent file download in LibreTorrent" but I can not download torrent cuz I need be looged in. Now I don't know how to change it? I want Android Firefox download it with its Downloads option.
If you're looking to change the default downloading option, do the following:
Go into your phone settings>apps>LibreTorrent>set as default>clear defaults.
Now when you try to download again, Firefox should ask you which app to use for that action.