How do you put in a reply to the operator?

Is it what the chain does?

I.e., to query the balance I need to dial *102#
that's easy, put that into the config. Then the operator sends back a menu, in which I need to select the 1st option, i.e. 1.

Should I put 1 into the chain box, or echo 1, or it doesn't work yet, or how?