Unable to set language of item in my library

Hi, from a Zotero newbie. I have started adding items to my library with my preference set to 'Chicago Manual of Style (full note). Some items have been added using ISBN, some added manually. Several items are in German and I want to set the Language field accordingly (where this has not been included automatically), so that when I cite these items the title is capitalised appropriately. In a few cases I have been able to type in 'German' but for most items the field does not open to allow data to be entered. What am I doing wrong? How can I enter the language?
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