The icon showing that One Drive is active is located in the bottom right hand side of the screen.
One drive not active
One Drive Active (Cloud icon)
If it is the first time using OneDrive click the Navigation icon on the bottom left of the screen and scroll down until you see Onedrive. Right click and select More then Pin to taskbar
The following icon will then appear in the task bar
Open the icon, this will navigate directly to the OneDrive folder