My civic won’t start after adding a fuel injection cleaner

What is your question?

First time this ever happened. I was going to schedule my 2nd oil change I just bought this civic one year ago, The first time I took it in for a oil change, they suggested that I have the fuel injectors cleaner, also stated that I needed the break pads replaced. I explained to them that I had the car certified with them 6 months earlier. That’s when he said the break pads were borderline and then he said that I could get the cleaner and put it in myself.so after adding the cleaner, it won’t start?