Radina Veliova offers a tutorial on how to say "I don't understand" in German.
How to Say "I Don't Understand" in German
Pronouncing words in the German language properly can help native or fluent speakers understand what you are saying. Search for a German language tutorial that will allow you to listen to an audio pronunciation of the phrase "I don't understand," preferably spoken by a language instructor or native German speaker.http://www.omniglot.com/writing/german.htm
The words for "I don't understand" in German are "Ich verstehe nicht." The phrase is pronounced as "ech vest-teah kneecht".http://www.youtube.com/watch?v=3E7Jzd6vN20