I am a novice and desperately require help. How do I enter my own store name on main page of cart, I have read the info via FAQ in tutorials section, but simply can't locate the area they suggest when I return to the admin section of my cart.

I fully understand how to introduce my own text but can't find where to do it. I open the template page where I find the default English language and default template, I click edit but there is no text box or someewhere to enter my own text.

Can someone please tell me step by step how to enter my own store name and remove the default congratulations message, oppologies if I appear stupid.