What do I do with the Social Security Number once I receive it?

You will need to re-enter GLACIER and input the SSN, then print all the forms GLACIER prepares for you, sign them and submit them to the address on the form.
You should also notify the Office of the University Registrar and email HRConnection@osu.edu your valid SSN.  All of these notifications are necessary as you may have been assigned various temporary numbers until you have received your valid SSN.