If you haven't checked out how to upload an image for use on the site, CHECK IT OUT HERE
Now that your image has been uploaded into the system, you have a variety of options when it comes to image use. In general, there are five uses for uploaded images: Banner, Background, Logo, Supporters, and General.
Let’s talk about the three options that are at our disposal once the image is uploaded. You have the option of using your image as your events LOGO, BANNER (horizontal view sites only), or GENERAL (general use throughout the site).
Adding images to your site is SIMPLE. Wherever your cursor is in the editor, your image will be placed. In the editor of the page you are looking to add your image to, you can select the image you've uploaded by clicking on the tree icon.
This will open a window where you can select your image:
And you can edit the size of the image in that same window: