First go to settings or follow the images.
now open another tab on your browser And go to this link: http://postimages.org and upload ur image. After upload, copy the direct link or follow the image.
now go to your Main tab which you open first for steemit.com and put your link to the profile or cover photo boxes. or follow the images.
if you complete all the step succesfully then hit tha update or follow my image.
Thats all. hope you have gotten the solution.