To add the stable repository:
flatpak remote-add --if-not-exists futr-stable https://flatpak.futrnostr.com/futr-stable.flatpakrepo
Or download the repository file.
To add the development repository:
flatpak remote-add --if-not-exists futr-continuous https://flatpak.futrnostr.com/futr-continuous.flatpakrepo
Or download the repository file.