I am building my store somehow thought I could do it no problem??!! Wrong!

I have tested my first purchase when I go throught the checkout the sucess page at the end has sample text.

I don't know enough about computers where is this located on my computer:
This file is located in /languages/english/html_includes/classic/

Also the same in shopping cart:
Your Shopping Cart Contents
You may want to add some instructions for using the shopping cart here. (defined in includes/languages/english/shopping_cart.php)

Thank you for any help you can give me I've been searching forums for 2 weeks now about everything!

www.thescrubshack.ca