New to Alice and programming

I'm completely new to Alice and programming in general! I've been playing with Alice and I made an interactive game. I've got most of it done but I'm stuck on how to ask for a number and then return with a value of my own. Any help with this would be great.

I've attached what I've done so far. On the "age start" tab my notes say what I want to happen.

Thanks,
Adrian D.