1. Open Settings & Check for Updates
Click the Windows logo → open Settings → go to Windows Update and click Check for updates. Install any available updates.
2. Go to Activation Settings
In Settings, navigate to System → Activation (or search “Activate Windows” if not visible).
3. Enter Your Product Key
Click Change Product Key, enter your key, and select Next.
4. Complete Activation
Follow the prompts to finish activation. Once done, your Windows will be successfully activated.