Patricia - hit your drop down inthe upper right corner, go to "Profile", choose edit profile and you will see the "upload picture" under your photo area. Click there, browse your computer for the one you want to use and viola! Upload! Cheers!
Do you have a jpeg or other accepted formatted picture on your computer? If so, you will go under your profile and click Browse. You will double click your pic from where it is saved on your computer and then on the Profile page, click Upload. I hope this was helpful!! Just let me know if you need any additional info! Have a great day!