bzr launchpad-login ulefr01 is not registered on Launchpad

za okt 15 22:44:57 ulefr01=546:~$bzr branch lp:flarebook
You have not informed bzr of your Launchpad ID, and you must do this to
write to Launchpad or access private data. See "bzr help launchpad-login".
bzr: ERROR: Target directory "flarebook" already exists.

Your display name is ulefr01, but your Launchpad ID is franz-ulenaers. Therefore, you should run:

bzr launchpad-login franz-ulenaers

Thanks

The bzr branch error from your second command:
    bzr: ERROR: Target directory "flarebook" already exists
stems from the fact that you already had a directory named "~/flarebook", but bzr branch lp:flarebook expects to create at the path it is invoked the directory "flarebook" and put the retrieved contents of the branch inside it. Your options include specifying the "--use-existing-dir" on the command line, moving the existing directory to another name, specifying an alternate TO_LOCATION, or removing the existing directory. If your present "~/flarebook" contains changes you wish to keep, back them up before branching with "--use-existing-dir".

Excerpts from
> bzr help branch
Purpose: Create a new branch that is a copy of an existing branch.
Usage: bzr branch FROM_LOCATION [TO_LOCATION]

Options:
  --use-existing-dir By default branch will fail if the target directory
                        exists, but does not already have a control directory.
                        This flag will allow branch to proceed.
[....]
Description:
  If the TO_LOCATION is omitted, the last component of the FROM_LOCATION will
  be used. In other words, "branch ../foo/bar" will attempt to create ./bar.
  If the FROM_LOCATION has no / or path separator embedded, the TO_LOCATION
  is derived from the FROM_LOCATION by stripping a leading scheme or drive
  identifier, if any. For example, "branch lp:foo-bar" will attempt to
  create ./foo-bar.