Hi Stephanie,
In the upper right of your screen, you'll see your name. Hover over that with your cursor and you will see a double list of options, one of which is Personal Details. Click on Personal Details and you will get a refreshed browser window. The second option is Avatar: If you click on the silhouette image, you will be prompted for an image file. Upload an image and make sure it is to your satisfaction and click Submit.
Welcome to the forum!