PREFACE: I prefer to use Notepad++ instead of Notepad, but it's up to you.
Notepad++
1. Open up your text editor. Make sure to run as admin.
2. Press Control + O or you can use the Open... function.
3. Navigate to C:\Windows\System32\drivers\etc NOTE: if you're using Notepad++, you'll need to paste that into the address bar.
4. Once in etc, open the file called "hosts."

5. Make your edits and save the file!
You're done!
Notepad++
1. Open up your text editor. Make sure to run as admin.
2. Press Control + O or you can use the Open... function.
3. Navigate to C:\Windows\System32\drivers\etc NOTE: if you're using Notepad++, you'll need to paste that into the address bar.
4. Once in etc, open the file called "hosts."

5. Make your edits and save the file!
You're done!