Hello shirleydudeck,
I'm John an Independent Advisor and a Microsoft user like you. I'll be happy to assist you today. I understand you want to know where to add apps on your PC.
The most common way to add apps to Windows 10 is to use the Microsoft Store app.
Press Start then search Microsoft Store
Search the app if it is available then click Get/Install
Kindly let me know if this helps or if you have any further concerns.
Sincerely,
John DeV
Independent Advisor