How to assign value to the user field in zoho crm using client script

How to assign value to the user field in zoho crm using client script

@Anonymous User @Anonymous User  @Anonymous User  @Anonymous User @Anonymous User @Anonymous User @Anonymous User 


How to assign value to the user field in zoho crm using client script.
Request To field type is User field 

Pls help to fix this 

if i select department  marketing means then Request To  want to show as user B