Need a help with tutorial

Hello, I'm new to Maya and I've got a problem with tutorial. 
http://www.creativecrash.com/tutorials/modeling-a-star-wars-walker/page5#tabs
I'm stuck. I don't know where to put these scripting things. I'm really bad at scripting.
And I think that interface/windows aren't the same in these two Maya versions (Tutorial version and mine[2011])
I think I've done something wrong in:
http://www.creativecrash.com/tutorials/modeling-a-star-wars-walker/page4#tabs
"Automatically parent the legs to the new ik joint creating 2 new bones that connect the 2 leg ik roots to the new ik bone root.."
If it helps I can upload mine model, to let you see it, and find out what's the problem. 
Here is what I've done till now:



- Red square - done, as I was told in tutorial. 
- I did NOT do anything else, only that what I've showed in screens. 
Nothing special happend after it. Please, help me, I really want to finish this tutorial, or I won't sleep :frowning:
Sorry for my english. 
If I'm being unclear - say it, i'll try to correct myself.
Thanks in advance. 

Your supposed to drop the expression (what you call a script is not a script its a esxpression) in expression editor.

That's me again, now I've got another problem:

Even if I select body it doesn't work. Got any solution? 

Thats because the objects called "Ltfoot" and "Rtfoot" do not exist.  Looking in your outliner, the object "LtFoot" and "RtFoot" exist. In maya everything is case-sensitive.

THANK YOU! It really helped! Problems solved!