Configuration is done via the applet menu. To enter the configuration menu click on the little arrow left of the applet (note: Kicker has to be unlocked to see this arrow), then choose Configure KBlogger, the configuration dialog pops up. There you can set all needed options, in case you don't know what an option means are here short descriptions:
API is the type of API you use at your blog, this can be either the Google Blogger API or the MetaWeblog API.
URL describes the path to the xml-rpc gateway, e.g. http://www.blogger.com/api/RPC2
Blog-id is the id of your blog on the server. You should have a look to your webinterface or ask your server admin to get it.