This is a tutorial for editing your photos in a program called GIMP. First you need to have the program, if you don't you can get it here: http://www.gimp.org/

Step 1: Open Up Your Project

When you have GIMP installed, open it up and click File>Open and then go to where you have your pictures and click it then click Open.

Step 2: Crop Your Image

NOTE: If you don't want your image cropped then skip this step.
Click on the "Toolbox - Tool Options" window and click the Rectangle Select, Then Select the part of your photo you want cropped, then click on Image>Crop to Selection and it will remove the part that is not selected.

Step 3: Change the Brightness

When you take your photos, sometimes it is too dark, this is where the Brightness-Contrast comes in.
Click on Colors>Brightness-Contrast. The brightness slider makes it Brighter/Darker and the Contrast slider makes the colors show more if you move it towards the direction of the brightness slider.

Step 4: Export Your Files

When you are done editing your image, click on File>Export and then click on the file you edited, then click Export,
NOTE: You don't save your file because if you do it will say that you can only use "save" for saving it in a GIMP File Format.