It's easy to create an account on Volt Commerce, simply sign up using the registration form on the home or pricing pages.
From the home page, use the registration form to chose a website name, enter your email address and set a password.
From the pricing page, choose a plan by clicking on it, then enter your website name, email and set a password.
Your website will initially be setup as a subdomain that looks something like this: yourwebsite.voltcommerce.com
You will be able to change your subdomain name in the admin system after your account is created if you desire.
If your plan support is, you can then link your own domain name to your Volt Commerce hosted website.
Once you have created an account, you can change any of your account information, like your email, billing information, or password, from the user menu in the top right corner of the site.