There are times when you may want to use a key of a different name to the default, perhaps to use separate keys for different projects. To let SSH know which key you want to use for KDE.org, you can keep a list of servers and their corresponding keys in ~/.ssh/config. For example,
Host svn.kde.org IdentityFile ~/.ssh/id_dsa_kde
In order to use SSH to access KDE servers you need to send your public key to sysadmin (at) kde (dot) org.