Cindy M. said:
Hi =?Utf-8?B?Y2hhcHB5?=,
Most often, if "Add to dictionary" isn't available in the right-click menu
it means there's a conflict between the available languages installed and
enabled on your machine vs. the language with which the text is formatted.
If you look at the status bar you should be able to see that language. If
you don't, right-click the status and activate the "Language" option.
Is the language of the text English (or the language you're expecting)? If
not, try selecting that section of text then applying the language you want
to use: Click on the language in the status bar to open the dialog box.