The ability to select colors / sizes / etc. is in the attributes controller - a built in function of zen.
To remove the "Congrats...." you need to look at includes/languages/english/index.php
To change the "Would you like to...." it's includes/languages/english/english.php
And to change the rest of that page - the text itself is in the file it references in that statement (includes/languages/english/html_includes )
Hope that helps :)




