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cultraraThe icon needs to be 50x50 pixels and under 8k in size. You can either create a new document in photoshop that is 50x50, or work larger and scale it down.
Try finding a pic you want, crop it as a square, then click file -> save for web. In the box that comes up, enter the images dimensions as 50x50 and lower the quality until it is under 8k. After you save it, upload it to NS.