To create a selling account on Crated just click Sign up on the homepage.
Follow the steps and input the information to create your account. Once that is completed you'll need to click Set up my Free gallery in order to set up a selling account. (If you click Start discovering great art you will set up a buyer's account.)
Now you will be taken to your Dashboard, this will be your home base to see notifications and statistics about your Crated account. To begin uploading images, just click Upload art.
Now you're ready to fill your gallery with images!