You can add words to include, exclude, and character names to the system by accessing the word list settings in the right sidebar as shown here:
Upon selecting one of the above options, a dialogue box should appear allowing you to add or remove words/phrases from your list. You can add your words one at a time or by bulk upload via a file.
You can also access this list by using a link found in each of the relevant reports, as shown here:
After you are satisfied with your changes to the list, remember to re-run your desired report to update the results in the right sidebar.
Here is a deep-dive video detailing the process of using the word list export/import process: