I just posted pics and understand your pain. Here is how I quickly resized my photos (no new software needed) via computer using Windows --- not sure how to do this on an Apple machine.
Hope this helps.
1. Copy pic to your computer. Remember location!!
2. Open Windows Explorer by following steps:
a. Right click on 'Start' button icon - extreme lower left of screen
b. Select "Open Windows Explorer"
3. Navigate to location of your picture
4. Note "size" of picture
a. Depending on the view you are looking at, you may not see the size.
b. If you do not see the size, change your view to "Details"
5. Right click on name of picture; select "Edit" --- mine opens in "Paint"
6. Picture will open in Paint
7. From top menu.... select the following:
a. "Home" tab at top
b. "Resize" --- another window will appear
8. Make sure "Percentage" radio button is selected.
9. Type 75 in horizontal text box (note, vertical text box will automatically update).
10. Select "ok"
11. Save and close pic.
12. Note new size of pic.
13. You may have to do the above steps again to get it to the size you want.
14. The ideal size of my pics were around 316 kb
**If you are still having trouble, please send me a PM.... I will try to personally assist.
Good luck!