To sign in to the OneDrive for Business app in Windows 8, enter your SharePoint or Office365 username and password and then select Sign In. To sign out of the app, select Settings Options Sign Out.pload files or folders to the OneDrive for Business app. To upload files in the OneDrive for Business app: Swipe up from the bottom of the screen or right-click any white space to show an action bar at the bottom of the screen. Select Upload. Select Files.