Hi MShomeuser, thanks for your question. I'm Graeme, a Microsoft Community expert and fellow user.
To activate Windows, you'll just need to click Start, type "activate" and select the first option. It should open a window with prompts you can follow to activate Windows.
If you're having trouble activating, you could try the Windows Activation Troubleshooter. You can find it here:
https://support.microsoft.com/en-us/help/20527/...
If you're still having trouble, please let me know what happens and I'll see what else we can try! Thanks!