Newbie here :)

Hello Everyone, my name is Tonya and I am embarking on a weight lost journey. I would love to create a circle of supportive friends. Please feel free to talk with me.
I have a few questions that I hope some of you can help me with. I am new to MyFitness Pal and I don't quite understand how to use the EXTRA calories gained through exercise. Today it says that I've earned 253 extra calories do I NEED to eat these calories> Or these calories here for me IN CASE I feel hungry? Please help.