Looks like some great food Joe. Excellent work.
If your running windows you definitely have paint. Which actually works well for many things. If your running Linux is happens to be even easier but since you probably have windows like 99% of everyone we'll go with this.
Anyway there is software out there, but everyone's got good old paint.
Hit Start Button
Find "All Programs"
Find "Accessories"
Click on "Paint"
Click on "Edit" on the toolbar
Click on "Paste From..."
Open your picture
Make the workspace in paint the same size as your picture - The first time you do this, the workspace is almost surely smaller than your picture so when you import the picture it will by default stretch to the size of the picture, but the next picture you try might be smaller than the one which preceeded it and so on. Whatever just make sure there is no white border around your picture. And you can adjust the workspace by putting the arrow of the corner of the workspace and adjusting it. Once that is done
Click "Image" on toolbar
Click "Stretch/Scew"
Then adjust the percent, I usually cut them down both to 40 - 50%
Click "OK"
If your satisfied Click "File"
Click "Save"
VERY IMPORTANT TIP - Save this as a .jpeg, paint's default is a bitmap. With shrinking the picture and jpeg compression, you'll have a great looking, nicely sized, and easy to post picture.
Good Luck.