If you have Photoshop, then yes, you should have a reduce image size feature. In Linux, I'm using Gimp, and I would right click on the image, highlight "Image", highlight "Scale Image", then click. Then what comes up is a dialogue box that gives me the option of reducing it by pixel size or percent. I almost always use percent, cuz my brain works that way.
With ACDSee (my favorite Windows flavor photo editing tool), I had it right there in the toolbar up top. A friend of mine had given me a free photo editing program he'd found online, I believe it's called "Irfan".. I'll do a quick search.
Always remember to "Save As" and give it a different name, or you'll lose the original.
If you'd like, you can email the pic(s), I'll reduce them, then send them back. Just pm me and let me know.