Connecting Input and Outputs of a VI

Hello,

I am fairly new to TestStand but I am trying to link, a VI's input with output. So I made an example project and doing the follwing:

First VI:

Takes two numbers and adds them and outputs the result to an indicator

Second VI:

Takes a number and squares it and outputs it 

They look like this

I can do this fairly easily in Labview, I would just link the out of the First VI to the Second VI's input. Can I do this in TestStand?

I only get this far before i got stuck, as demonstrated in the picture below:

Do I have to hit f(x) and link it somehow to the first VI in my main setup? (which look like this):

Apologize in advance if this is really straightforward and I'm missing something obvious!

Any and all help is greatly appreciated.

Cheers!