I installed these apps earlier. Install the 3 apps, Word, Excel, and PowerPoint. Then when you go into Word or whichever one you choose first, it will show an intro screen that you can scroll through by hitting the next arrow on the screen. I think on the third or fourth one it allows you sign in; if you have a home user subscription, login with your Microsoft ID. If you have a business account, go to the organizational login instead. It didn't ask me to log in to the other apps so I assume you only have to do one.