Navigate to OneDrive for the Web. You can get there by going to [portal.office.com](http://portal.office.com) and clicking OneDrive from the top-left menu. Or, from your PC, you can click the OneDrive icon on your taskbar and choose "View online" to take you right there. 

In OneDrive, navigate to the file you'd like to share. Hover over the file then click the "Share" icon.

In the pop-up, click the "To: Name, group or email" field.

Start typing the name of your colleague to search for them.

To assign their level of access, click the pencil icon and choose either "Can edit" or "Can view." 

Optionally, click the "Message..." field to add a custom message that will appear in their email. Click "Send" and you're done! 

These steps show just how simple it is to add a colleague as an editor to a document.

How to Share a File in OneDrive Online