Hi durleybeachbum,
I first re size the image to save...Photoshop doesnt like saving massive size files for the web
If you have photoshop ( depending on what version ) go to FILE - Save for web.
Up comes a new window and below the image it tells you the files size.
The is an option for things like jpeg...gif etc.
Select jpeg and move the quality slider and as you move it the file size indicator will change. 
When you happy just save the file...I usually save the new file into a different folder...mines called Rosity.Then when you are back on the original image if photoshop asks you if you want to save the changes say no as you have already saved the file under a new name...also prevents you from saving your pride and joy as a new file and realising you just wrecked it.