To view and manage your profile navigate to Buyer>Manage My Profile. Here you can add images of your store, your logo and a bio picture of yourself. You can add a short bio telling artists a bit about you and your shop. At any time you need your Buyer ID# you can grab it from your buyer profile page.
On your profile you can also update your contact info, shipping and mailing info and store information. To edit each section click on the edit icon.
When you place an order with an artist they gain access to view your profile so it's important to keep your profile up to date.