How to create record in Contacts? C# API

How to create record in Contacts? C# API

Hello everyone, 

I'm able to create a contact in Zoho CRM, but I also need to create a record for it. So, I will call for moduleAPIName that name which I'm using for Zoho Responses, which I created, but how I can understand for which contact I will do that? 

I'm using this link:
https://www.zoho.com/crm/developer/docs/csharp-sdk/v2/record-samples.html?src=create_records

In Contacts I created field like Responses and then created record for it:


How could I create for my Responses record using C# API? 
How to get exactly that user and create record for him? 

Thank you in advance! 

Best regards,
Vladimir