We know designing things can be hard, that's why you can use our built-in announcement maker. If you'd still rather upload your own image, you can do that too! They just have to be 1160x464 pixels and in JPEG format.
To begin, go to the announcements editor, click on "New Announcement", and then "Upload Image". After you've selected the image you'd like to upload, you can set a title for the announcement, and optionally, a URL for the announcement to link to. You can also set "Show From" and "Show To" to schedule when the announcement is visible.
Click on "Create" and your announcement will be scheduled!