All spreadsheet formula should start with

A formula in Excel will ALWAYS start with = then the function name like
=SUM(A1:A5)

You need to call the office. and then you need to give them a reason on why you want to change your username.

Metaprogramming  is a programming technique in which computer programs have the ability to treat programs as their data. it means that a program can be designed to read, generate, analyse or transform other programs, and even modify itself while running. ps: you don't have any options there.