Assisted Transfer

I have never used ASTassistant before so I have a few questions.

1. How can I enable the feature that allows me to screen a call before I tranfer it. My Employer does not want calls to be blind transfer. I am using Version 1.2.1.1 and from what the guy at Trixbox said my whole package is 2.6.2.3.

2. It keeps talking about using the new Betas. Once I download the beta how do I implement them in the program I am using?

Sorry for all these newbie questions but I am not sure how to use the utilize AST very well.

Thank you