adding text to checkout pages

[NeilPeart]

Hello
I have a client that would to make the changes
like to either change or add text to the checkout pages but I cant find the php files

If the box to confirm the order details is not clicked the message that comes back says "Please agree to terms of service." Please change this to "Please review your order and confirm the details are correct by clicking below."

In Checkout Step 2: Please select a shipment method. Please add the following: "*Please note that delivery times are not guaranteed. We will contact you to confirm your delivery window."

In Checkout Step 3: Please select a payment method. Please make the exact change notice on the COD option larger and red.

any idea what php file this ( these ) would be?

thanks

R

[K&K media production]

You can use language overrides

http://www.inmotionhosting.com/support/edu/joomla-25/language/add-new-language-override