Programming Information for Notel Phone System

Hi!

I have an old phone system with a NT5B01 KSU and M7310 phones. I don't have any information about programming the phone system other than setting up speed dial keys, etc.

Specifically, I want to change what lines are used when a handset is lifted. For example, the system picks up line 2 first and, if engaged, picks up line 1.

Can anyone tell me how to change the line configuration to choose line

Thanks!