Open the Excel workbook
Click the File tab
Click Info
Click Share Workbook or Share, depending on your Excel version
Turn on sharing or co-authoring options if available
Save the workbook to OneDrive, SharePoint, or a shared network location
Click Share
Enter the names or email addresses of the people you want to share with
Set their permissions to Can edit or Can view
Click Send
If using older Excel versions, go to Review
Click Share Workbook
Check Allow changes by more than one user at the same time
Click OK
Save the workbook when prompted