Sorry, if you have enabled Shipping for any product in the buyer's order, our cart will require them to enter a zip/postal code before going to checkout.
You can at least change the text labels next to those fields in the cart by adding these lines to your View Cart code on every page where you are using our buttons, just before the "// -->" line in the standard code we issue:
function EJEJC_config() {
EJEJC_POSTCALL=true;
}
function EJEJC_shown() {
jQuery("#country1").attr("innerHTML", "Your Country");
jQuery("#state1").attr("innerHTML", "Your ZIP/Postal Code");
}