How do I earn rewards?

I'm sorry but I don't really know how their program works

Once you have an Irving Rewards card and have created an Irving Rewards account, you’ll earn a 10¢-per-gallon fuel discount with every 50 gallons of fuel and a 5¢-per-gallon fuel discount after every $50 spent in the store on qualifying merchandise, by swiping your card at time of purchase.