In the top nav bar, click on the "Profile" dropdown. It will expand.
Click on the ( Menu) icon on the top right corner of the page. The menu will expand.
Then click on the dropdown that says "My Profile". It will expand.
Then click on Upload Photos in the list of links.
You will see a list of the photos you have already uploaded.
Find the photo you want to crop, and click the " Crop Thumnail" button. You will be taken to a new page where you can crop your photo.
IMPORTANT: You must rotate your photo FIRST, before cropping it. (otherwise you will be cropping an upside down photo).
A rectangle will appear over your photo.
Click inside this rectangle, hold down, and drag the rectangle around on your photo.
To resize this rectangle, click on one of the corners and drag.
Whatever appears in this rectangle will be the cropped version of your thumbnail photo.
Once you have have the rectangle where you want it, click on the "Save Crop" button.
IMPORTANT: Rotate your photo first, BEFORE you crop it.