Texas Sarge:
Sounds like you may be trying to attach the image as it came off your camera (.... which could be as much as a megabyte or more in file size - i.e. far over the maximum 150 kilobytes allowed here ....)
You should have some sort of image editing software on your computer - including something that came with the original software package, quite likely, as well as whatever software came with your camera that has allowed you to download the image to your computer. They all differ somewhat, at least in the names they assign to different functions - but you should be able to locate a "size" or "re-size" command (or some similar term.) When working with that particular image, it should tell you what size the image presently is, and then give you options to re-size it. Ideally, this will be expressed both in terms of dimensions (i.e. so many inches, centimeters or pixels in width and height) and also file size (i.e. so many kilobytes). Using the latter, you should be able to re-size the image to no more than 150 kilobytes (or whatever other size you want) for posting on the internet.
NOTE: do not just "save" this re-sized image, since that will likely replace your original image in memory with the much lower quality and resolution image you have just created. Rather, use the "save as" function instead, to save the new image file under a different name - I often use the existing name, with a "sm" (for "small") or "low res", or some other such supplement added to the end .... that way, if you have saved the new image to the same file folder as the original, they should appear together on the list of folder contents. Keeping the original image file as downloaded from your camera isn't necessary, but if you ever want to get a print made from that photo, or print it yourself, it is that original high resolution image you'll want to do it from. The new low res image you have created will be just fine for posting on the internet, since most computer monitors only display a fairly low resolution image anyway, and any excess resolution is wasted in that application.
(If all else fails, e-mail the image to me, and I can re-size it and post it for you ..... However, you'll likely want to try to familiarize yourself with the process and learn to do it yourself, of course.)