trying to upload a pic

im trying to upload a pic on raceny.com. First they want to make it 640x…
now they tell me this…

Error

One or more of the images or attachments you uploaded exceeded the maximum allowable upload size (which is 75 kilobytes). These images or attachments have been removed from your post. If you would like to include images or attachments, upload new files after you make sure that the size is not greater than 75 kilobytes.

THIS IS ONE OF THE REASON I GET SOO FUCKING PISSED @ THIS BOARD!!

So i do i adjust kilobytes?

Open image in photoshop, when prompted to save you can lower the quality. Yeah it sucks.