Step 2.) Open the Media Creation Tool you just downloaded. Select the option "Upgrade this PC now".
Step 3.) The tool may ask which files you want to keep. Keep everything and then click next. The Tool should do the rest on it's own. Your computer will restart a few times during the upgrade.
Step 4.) Once the upgrade is complete, you need to check if it has successfully activated. Click on the search bar in the taskbar and search for "activate" and choose "See if Windows is activated".
Step 5.) If it shows "Windows is Activated", then you're all good to go! If it's not activated, make sure you're connected to the internet, and then click the "Activate" button. It may take a few moments to activate.