To change the names or number of the levels use the settings button above the Problem Tree on the right. Here you can rename the levels, add a new level, and delete levels as you need.
To view the different languages of the Problem Tree, use the language selector on the top-right just above the Problem Tree graph. Translations can be manually created by clicking the edit (pencil) button on the selected item and changing the text.
To export the Problem Tree, click the export button and choose your format.
To comment on the Problem Tree, use the comment box at the bottom of the page.