Hi Wendy, welcome to the forum!
To use Text Blaze in Microsoft desktop apps, you need to download the Text Blaze desktop app. We have a both a Windows and a Mac version.
The Text Blaze browser extension only works within the browser, but if you have both the extension and desktop app you can use it anywhere. You can log into the desktop app with the same account and your snippets will be synced.
Let me know if you have any questions!