How do I know to switch screens to make payments?

After application entry in CPS, the bottom of the screen will have two buttons; "Submit and Pay by Shopping Cart" or "Submit and Pay by Cash". If you select Submit and Pay by Shopping Cart, you will receive a message that says you have successfully completed the application and will need to "Click Here" to close the CPS message, which takes you back to the MDOT Permit Gateway (MPG) to make payment in the Shopping Cart.