1. Click on "Tools" on the menu bar at the
top of Ex cell and scroll down then click on "Options". If "Options"
is grayed out to where you cannot select it you will need to open a new
spreadsheet; this will allow you to select "Options".
2. Next you will see a window like the one below. Click
on the "Security" tab and then click on "Macro Security.".
3. Next you will see a window like the one below and you will need to select "Medium. You can choose whether or not to run potentially unsafe macros."
4. Now close Excel and reopen the grade book, you will now be able to select "Enable Macros".