Insert Existing Working Code From Another Workbook Into Own Workbook

The amazing code I saw was from this thread Auto lock cells after data entry when file saved... where the code was made by Jafaar Tribak.

It basically locks cells that have had data inputted into them when the file is saved (with a nice prompt warning of the used cells being locked.

This is Jafaar's file [URL]

And this is my file where I'm trying to make it work in the "Employee data entry" Sheet:

[URL]

And finally this is the file after I tried to copy the code over : [URL]

Trying to make it so that in the employee data entry sheet locks cells after an employee inputs some data into said cells.

I thought that by setting an "inputrange" on the employee data entry sheet the code would track it down automatically but maybe I'm completely wrong. I cant see anything wrong with it (probably because I"m not that good at vba) but I fear I may have left out something really simple!

I seem to disable my other macros when i try to insert this code in (I have a macro that when you click on a cell a calendar pops up so you can click on a day from the calendar rather than typing out the date)