Pressing F1 to get help brings up the help center which complains that there are no help.
I can not reproduce that with svn trunk build yesterday, Help launches helpcenter with the documentation, it is correctly installed here
Git commit 2d04d3d3a7853968ddd32470d0748ec40a14b1e2 by Miika Turkia. Committed on 12/02/2012 at 14:29. Pushed by mturkia into branch 'master'. Including documentation to the build M +1 -0 CMakeLists.txt http://commits.kde.org/kphotoalbum/2d04d3d3a7853968ddd32470d0748ec40a14b1e2