Images should be resized before they are uploaded
If you don't have Photoshop, there are a number of free options for editing images (resizing, cropping, etc.).
Because BeFunky has decent video tutorials, they are referenced here.
BeFunky, Pixlr, and Fotor have very similar functionality.
GIMP and Canva are a bit more complex.
How to Edit Photos BeFunky
How to Save Photos BeFunky
Image Size Guidelines
Maximum width: 1170px
Image file size should not exceed 500kb
Faculty staff portraits: 200x300px
Picture menus: 800x533px