create date and windows user JS codes needed and how can I fill them into a PDF

I need JS codes for the create date of a pdf formular and a code that takes the windows user that oppened the documente.

I use "Adobe Acrobat Pro DC"

Where can I fill in the JS codes in the pdf document?

1) tools, JavaScript, under add the code right?, under Skriptname any name right? and how can I fill it in in the pdf formular after I did this?

2) tools, Formular prepare, dobble click a description field, format, user-defined, user-defined key input, edit, give the code in and how can I fill it into the pdf formular now?

If non of those two versions work can you tell me howI can fill it into the pdf correctly?

If one of those versions work, can you tell me than how to get them into the pdf that I see them?

Thanks for helping in advance

Yannick