Welcome, Amy!
Here's how it works... as long as you are "burning" more calories than you "consuming" then you will gradually lose weight.
Now, that does not mean you have to "excercise" away the same amount of calories that you "eat". In fact, that would be virtually impossible -- you'd have to run on the treadmill for a few hours and then some to burn 1000-2000 calories. SO, the goal is to have a DEFICIT.
Your body itself, whether you excercise at all or not, is burning calories every day. In fact, it burns 15 * (body weight) every single day. What you need to make sure to do is have your body BURN MORE calories than it CONSUMES.
Let's take an example to make this real and not just theoretical:
It looks like you weigh 202 lbs right now. Your body alone will burn 3030 calories PER DAY automatically. (202 * 15). So, if you eat 3030 calories per day, your body will burn ALL of it which will leave you at the same weight (since 3030 calories - 3030 calories = 0 & you have 0 deficit)
What you want to do is eat LESS than 3030 calories so that there WILL be a deficit. For example, if you at 2500 calories PER DAY, you would have a deficit of 530 calories per day. That is just from food intake alone. If you excercized AS WELL, then you could add that to the deficit.
3500 calories = 1 lb whether you gain it or lose it.
GOAL - have the overall calories in a day/week be LESS than the overall calories that you burn (your own body + excercise)
Hope this helps!