Two Question about DBConfiguration with MSSQL

Two Question about DBConfiguration with MSSQL

Hi,

How can I configure the field's host DB  when my DB Server has a Instance?
Ex: 
      DB Host: nameserver
      Instance: APP                  
      Database: Opmanager

I created manually the database for Opmanager on MSSQL and I created a new user with dbowner privileges for security reasons. Is it a Problem or I must use the sa user? 
 
Thanks,
Thiago Morais

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