You'll need to resize your photos;
Right click on the file (photo)
select "open with"
chose "microsoft office picture manager"
once your photo opens go to the top and click "edit pictures" and click
a side bar will open and at the bottom of it you will see "resize", click.
then select "predefined width x height"
click on the drop down and select "web-large"
once you do this then select "OK"
Your photo will be resized. You'll need to "save" this photo or "save as". then you can load it on the web site.