Create a background image for Instagram posts with ainstem cartoon drawing

Create a background image for Instagram posts with ainstem cartoon drawing, These posts will have several images in slides in a single post., steps, to the page named loopsemsaida which is a programming page, where in front of this background image things will be written to be posted on Instagram, can put drawings on the screen, programming cardboards, the image needs to be technological, or something like that, the image needs to give a sense of learning, put watermark on image loopsemsaida