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how to change dpi on a jpeg

It will point you to Irfanview. with it you will be able to change the DPI of your image. Since the number of pixels won't change it will shrink the apparent size of your image from 44x55 inches to 8x10 inches.

It still would be nice to know what it is that you do that requires the image to say 400DPI. since you say you don't know how we got on to the subject of printers and DPI is mostly limited to printers, what is it that you do? A computer monitor is fixed at what ever pixel pitch it is made with so thta can't be it.

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13