i have many product images, how to rearrange the order of the product images?
Sorry, you can't. Yes, it's a logical feature, and one of the most commonly requested. Maropost have shown no interest in fixing it over many years.
Best you can do is download all your images for that product, then upload them all again in order. Silly, I know.
....thank you for your prompt reply, saved me lots of time trying to figure out how to do it ...