I'll take some 
In Google Docs/Drive, if you open the spreadsheet and click on SHARE (upper left corner), under WHO HAS ACCESS in the popup window click change, VISIBILITY OPTIONS - Anyone with the link, ACCESS - Anyone - Select "CAN EDIT".
In Google Docs/Drive, if you open the spreadsheet and click on SHARE (upper left corner), under WHO HAS ACCESS in the popup window click change, VISIBILITY OPTIONS - Anyone with the link, ACCESS - Anyone - Select "CAN EDIT".