Comment # 1 on bug 953175 from Wolfgang Bauer

(In reply to Alvin Demeyer from comment #0)
> 1. Start kcmshell5 kcm_kaccounts
> 2. Press + or 'Create'
> 3. Nothing happens.
> 
> It is currently not possible to add a Google, Live, ownCloud,... account to
> KDE applications using this method.

Install the package kaccounts-providers, and it should work.
Apparently a package dependency is missing somewhere. (probably
kaccounts-integration should require or at least recommend it...)

> (also, the Help button in that window doesn't work)

Please report this upstream at http://bugs.kde.org/ (product "KAccounts", I
suppose).