You can access the supplier list in Backend Magento → Retail Management → Manage Suppliers
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on RMS through Purchase Management->Manage Suppliers
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In the list, you can either create new suppliers, edit a supplier, or import supplier from a CSV file.
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How to create a new supplier
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First, you need to click on Add the New Supplier button. You will be redirected to a new supplier details page.
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There are is information that you need to fill in before saving this new supplier.
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How to edit an existing supplier
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You can click on View button of a supplier on the list, then you will be redirected to its details page, where you can edit the information of the supplier.
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How to import supplier by CSV file
You can learn how to import supplier suppliers by CSV file in How to import supplier by CSV file