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This is probably not the section to ask about this...but whatever.
If you mean the actual size of the image, you probably won't have to use an outside program. When linking images, one puts in something like [[File:Imagenamehere.png]], right? You can add a parameter like |200px to after the "png" part and before the closing square brackets to resize the image to 200 pixels wide. (And of course, the number can be changed to any amount of pixels.)
If you mean actually cropping, like for equipment, then yes, you'll need an outside program. It should be fairly easy Microsoft Office Picture Manager. Just right-click an image, go to "open with", and you should see the program on the list. On the off chance you don't have the program, Paint.NET, which you can download for free off the net, should be able to crop pictures as well. I think Photoshop will work too, if you have it.
And...to answer a question asked earlier, you'll need to physically make at least thirty edits to the wiki, as well as become an autoconfirmed user (which I think is after 4 days with an associated email address) before you're allowed to create your user page.