Hi Greg - I see you had a bit of trouble getting started. Did you figure it out in the end? You use the link Translate this Page first, then set your language in the screen that comes up. The "Translation Tools" link in the sidebar will help you track the status of translations to your language.
http://userbase.kde.org/Translator_Account User Name: GregKoval
Do you expect to work off-line?: No
Yes, you have been added to the translator group. On any page that is ready for translation you should now be able to see the "Translate this page" link above the language bar. It's only visible to logged-in users in the Translate group. Click on that, then choose Polish in the screen that comes up next.