Good day! Let's make sure that you can find the app and continue working, jdj6268.
The shortcut in your desktop might have been removed when your computer was turned off. You can manually search for the desktop app so you can open it.
Just click the Start menu, and then scroll through the alphabetical list on the left (if your Start screen is set to show as full screen, select All apps, and then scroll through the list).
You can also type in the name of the app in the Search bar.
Here's an article from Microsoft for more details: Find All Your Apps and Programs.
Once you find it, use the steps in this article from Microsoft on how to add the app back to your desktop: Pin Apps and Folders to the Desktop or Taskbar.
I'd also like to share a couple more articles for additional references since you're new to the product:
Keep us posted if you're able to find it. Please know that the Community is just around the corner if you need anything else.