Linking Merriam-Webster Dictionary

You can also double click on the word in your commentary and it will attempt to open that word in your highest prioritized English dictionary. You can add the Merriam-Webster Dictionary to your priority list in your Library panel to ensure that it's preferred over other English dictionaries you might own.

What word are you right clicking on? The most likely reason it isn't finding a resource anywhere is that the text has an inflected form of the word, and the dictionary only contains uninflected forms.