Pull The Pin The Tire On My Riding Lawnmower Is Flat And Off The Rim. A Guy Told Me To Pull Out The Pin In The Hose...?

The tire on my riding lawnmower is flat and off the rim. a guy told me to pull out the pin in the hose...? - pull the pin

They allow the air to spray on the sides, put the PIN code, then refill with air. But ... I can not pull the pin hose beast. I have a needle nose pliers to pull and twist the stupidity, but it will not go. What am I doing wrong? Please help.