I have a problem! In my Club, I would like to put a picture in the پیپر وال section but keep uploading it in the تصویر section, what should I do? Please, answer me

Resize and crop the picture. A picture must be large and a very specific size to be considered a wallpaper. The dimensions I always use are 800x600, 1280x800 and 1920x1080px.