How to add text to a dynamic stamp?

Hello everyone,

For our company, I have created several dynamic stamps that change the time and date. To do so, I used the following custom script :

event.value = (new Date()).toString();

AFDate_FormatEx("h:MM tt, mmm dd, yyyy");

However, I cannot make the field adapt to the server it is on. Each employee has a different computer with their own log-in, and I want to make a dynamic stamp that can change the name in the stamp depending on the user.

For example, our stamp currently says:

RECEIVED

Time, Date, Year (the latter being dynamic)

What I am trying to do is:

RECEIVED

By NAME (a dynamic fieldthat can adapt to the name of the server it is on), Time, Date, Year (also a dynamic field) 

Does someone know the script to enter in the "Custom Calculation Script" box to do so?

Thank you for your help!