Red "transform" box around image

Hi there I am very new to illustrator and used to using photoshop. I have created a simple black background then added a layer I have then dragged and dropped an image of a flower into my first layer but a red "transform style" grid appears around the image. I can press cmd 2 to remove the red grid but that means my image is then locked and  I cannot move it?

Does anyone know how I can simply drop an image into a layer rezise it then get rid of the red transform style grid surrounding my image and then be able to freely move my image around?

Thank you