Go to your OneDrive for Business folder, click on (…) to show actions and click on Share.
A pop-up will appear and you can select who you wish to share the file with. If you wish to share with specific people, select the ‘Specific People’ option and key in their email addresses so that they will receive an email notification on it. Click on ‘Allow Editing’ if you wish to give permission for the users to edit the document.
Once complete, click on Apply and Send.