\\[gnus-bookmark-bmenu-delete] -- mark this bookmark to be deleted, and move down.
\\[gnus-bookmark-bmenu-delete-backwards] -- mark this bookmark to be deleted, and move up.
\\[gnus-bookmark-bmenu-execute-deletions] -- delete bookmarks marked with `\\[gnus-bookmark-bmenu-delete]'.
\\[gnus-bookmark-bmenu-delete] -- mark this bookmark to be deleted, and move down.
\\[gnus-bookmark-bmenu-delete-backwards] -- mark this bookmark to be deleted, and move up.
\\[gnus-bookmark-bmenu-execute-deletions] -- delete bookmarks marked with `\\[gnus-bookmark-bmenu-delete]'.