What is the appropriate response to someone who says: How do Allah and His angels send blessings upon the Prophet, and how do we send blessings upon him?

To clarify the meaning of "Salat upon the Prophet (peace be upon him)," there are several topics in the English section of the network about inviting to Islam and refuting misconceptions, such as "WELCOME TO ISLAM," "WHAT IS ISLAM?", and "MISCONCEPTIONS."