Steve, it's really easy to make your pictures smaller using this link
https://pixlr.com. Like all this computer stuff, it's not necessarily easy until someone shows you. Here are some instructions if you are inclined to try it:
1. Go to above link and scroll down to "Pixlr Express" -- click on "Launch Web App"
2. Click on "Browse" - this will open a window showing your computer file system. Click on the file (picture) you want to make smaller and then click "Open."
3. Now you have the picture you want to modify loaded into the program. Click on "Adjustment" and then click on "Resize."
4. Now you will see a little tool for resizing your picture. Notice that there is a little slider bar called "Keep Proportions." Make sure that is slid over to the right. If you don't have that slider bar in the correct position, it is possible to distort your pictures. But if it is in the correct position, you can just change one dimension (height or width) and the other will automatically change to the correct number.
5. With the slider bar in the correct position, change the width to 1020 (example) and notice that the height automatically adjusts to 680 (example). Click "Apply." The picture is now resized and all that's left is to save it to your computer.
6. Click "Save." A window pops up that will allow you to give it a name and adjust the quality. For naming it, you might just want to add "-small" to the original file name. For quality, it is usually fine to just leave the slider bar where it is. Once you have named it and set the quality, click "Save" again.
7. Now the window showing your computer file system pops up again. This will allow you to control which folder you want to put the -small file in. By default it will put it in the same folder as the original, which might be where you want it. When you have it where you want it, click "Save" one more time and you're done.
8. As long as you give the file a different name (by adding -small to the original name) the original file will remain unaltered. But if you don't change the name AND you save it to the same folder as the original, the original file will be written over and you will lose your high quality original photo.
It's a piece of cake once you've done it a couple of times. Takes less than a minute and the size of your pictures will be reduced from megabytes to kilobytes with no reduction in quality (when viewed on this forum).
Once you have that mastered, you might want to look at the "crop" feature. That one allows you to cut out just a portion of a picture and make it the same size as a full picture (for showing a detail).