Feedrate/Flowrate Confusion?

I am printing a tall cylinder and the first few tries it broke only about 30mm high. I was told to slow down my speed. This is where I'm confused. Do I slow down the feed rate, flow rate, or both?

You would want to slow down the feedrate. The flow (of filament) will be adjusted accordingly to match the speed

Thanks, got it. Started a new print and all seems to be going good now.