Open the Office app. On the Account screen, tap Sign In. On the Sign In screen, type the email address and password you use with Office. This might be the personal Microsoft account you associated with Office, or the username and password you use with your work or school account.
Using Free Office Web Apps Visit the Office website. Click the Office program you want to start. Sign in with a Microsoft account. Use the program. Save your document. Upload documents to your OneDrive storage to open them with the web apps.
On Office Online Go to www.Office.com and in the upper right-hand corner select Sign In. Enter your email address and password. This might be your personal Microsoft account, or the username and password you use with your work or school account. Select the App Launcher and then select any Office app to start using it.