How do I assign a database column / query value to a session?

I can’t seem to find to how to assign a database query field value to a session, I got this far as to create the session name, but don’t see where I can bind a field to it.

All I see in properties below in my screenshot is a Linked Field area, which I expected to have something to click to the right of it to see queries etc… to click on, see the field in the query and bind it, but maybe I’m just not on the right track for this.

What are the steps I need to do this?

In classic asp all I need to do after a queryis something like the following:
Session(“session_first”) = (rsUser.Fields.Item(“first_name”).Value)

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