You may need to log in as a Self Managed or Ad hoc Supplier to update admin for that supplier or perhaps create products for that supplier. To do this you would follow the below steps:
At the top, click on the Admin Cogs.
At the left, click Suppliers.
At the left, click Manage Suppliers.
At the top, click Self Managed or Ad Hoc.
At the right, click Sign In after the supplier's name.
📌 Note: if you do not have access to log in as the supplier then you will need to contact your Head Office or super user.