Cathy Scholz-Caspar 

Easiest way is to make sure your project is selected in the Projects View, then click on Project Settings, navigate to Termbases and add your "Terminology type_DE-DE_EN-FR.sdltb" there:

Once you've added your termbase you can use the Terminology Verifier with various settings to help you find anything that may not be using terms in your termbase:

Thanks Paul but unfortunatly I receive this message:

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Fehler

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General error occurred MultiTerm kann das Multimedia-Objekt nicht abrufen.

General error occurred MultiTerm cannot retrieve the multimedia object.

When I bought the licence, I had both exe. Files, i.e. Trados and Multiterm in one folder and then activated them one after the other with a double click and installed them on the desktop. Do I have to link Multiterm in Trados or why are the files I click on not recognised? 

Thanks for your Help,

Cathy

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I finally found the problem. I still had Trados Studio 2015 installed on my computer and it was preventing the new program from recognising or accepting the terminology file.

Thank you again for your Help

Cathy