Step 1: Log in or register for a developer account.
If you have an existing Magento account, simply log in and complete the developer registration process. If you are new to Magento, you can sign up for a new account and register as a developer at the same time.
Step 2: Agree to the terms of service.
Read the Magento Marketplace terms of service. Then, select the checkbox to agree with the terms and continue.
Step 3: Complete your personal profile.
The information in your personal profile identifies you as an individual vendor in Magento Marketplace, and includes your background, image, contact information, and social network addresses.
Step 4: Complete your company profile.
Your company profile is similar to your personal profile, and provides the information about your company and brand that appears in your Magento Marketplace listing.