You need to have a program that lets you edit the picture.
Windows Paint can do it but it's not the easiest program to use for cut/paste changes.

but i like to use one of these programs {free & downloadable}
Picasa -
http://picasa.google.com/
or
Photoscape -
http://www.photoscape.org/

Picasa is easier to learn - it will automatically find all
pictures on your computer and add them to the program when you add them on to your computer.

there are probable some simple and smaller programs for just resizing and cutting.