Once you have (re)named you document, click on the 'Rename' button.

To (re)name a document online, do the following: Any changes you make to the document will be automatically saved. The document will open using Office Online. The document will open in your web browser or it will open in a new web browser tab (depending on your browser settings/preferences). To edit a document online, do the following: When editing documents via OneDrive, you have two options: You can edit the document in an online version of the application (Office Online), or you can edit the document in the desktop application (as long as you have the desktop application installed). You can edit documents directly from your OneDrive library.