Adding keywords to your products is a great way to ensure they get found on your website.  There are a few ways to achieve this;
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To do this manually: 

Products > Products > search and select SKU by clicking on the code > click keywords tab > type in keyword and select from list which will appear > save. 

To do as an import:

 Products > Products > Import > Import Product Keywords > Download Template > Fill in relevant fields > upload & save.

There are only 3 columns to be filled in so this is fairly simple to do 👌

The Supplier ID field for the import can be found within the Suppliers tab.