Implementation of Custom Fields in Bugzilla Error- editing Custom Field

[usmle Prep]

I installed 2.16.2 on Red Hat Linux 8 but couldn't
find any scripts related to Custom Field
implementation like editcustomfileds.cgi and so on.Is
there a document on how to implement this?
On our production environment it was already
implemented I don't know how and on the production
server  when editing a custom field I am getting this
error  

Attempted to send tainted string 'Update
customerfileds SET type='multi',
valid_exp='Test|Dev|QA|Field',
mandatory=0,default_value='test1' where id ='45'' to
the database at globals.pl line 251.


Is there a way to change the name of the custom field
itself while editing the custom field.
Thanks,
Srikant

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