You can add buyers to your Online Trade Show retailer profile in your settings.
1) Head to Settings and select "Store Profile"
2) Once in your store profile, scroll down to "Buyers" and you will see all the buyers listed for your company. For new buyers, you can add the buyers information under "Add New Buyers" and select "+ Add This Buyer".
Once the buyers information has been added they will have access to the Online Trade Show.