To view an account from the supplier's view you will need to Ghost Login.
Within your admin account click on Manage Accounts on the left-hand side, then on Vendors.
Once you filter your search for the specific vendor you're looking for you will notice under the column Users there is a blue highlighted user login (there can be multiple ones, in which case they're separated by commas and you can select either) that you will need to select.
Once you select the user a pop-up box will appear with their user information. To the right of First Name you will see a little ghost icon you will need to select that will log you in.
You should now be logged in under that specific user and should see everything from their point of view. To verify this you will see their user name with the ghost icon to the right of it in the top right-hand corner of the page. To logout and back into your account simply select that ghost.