None of them is for YOU. The Yast Online Update (YOU) has it's own list of servers. You shouldn't need to change these.
This list is for adding installation sources to the Yast module 'Install and Remove Software'. What may has caused a little confusion is, that adding sources enables you to install 'updates' of KDE and Gnome. But it has nothing to do with the security updates and bugfixes you get via YOU.
So what you do is:
Open Yast -> System -> Change Source of Installation
click 'Add' -> FTP (or HTTP in case of the packman source)
specify the server and the directory
no slashes in the server entry, no leading slash in the directory entry, do not specify a path in the 'Server' field.
just an example (don't use the main server, find mirrors here
, add (only) the KDE source like above, open the 'Install and Remove Software'
module, select the filter 'Installation Summary'
, check 'Keep'
and click all entries that appear blue
until the greenish 'update' sign appears, then 'Accept'
From Packman you can receive a lot of recent multimedia packages, codecs etc.