A tag is a keyword that can be used to categorize your deals. Tagging can be useful when you need something to quickly filter information by. For example, if certain Deals are more valuable than others, adding a “Premium” Tag to them can help differentiate them from other Deals.
If you are on a Small Business plan go to Sales > Deals
If you are on an Online Store plan go to Wholesale > Deals
Click on the name of the deal you need. Tags can be found on the left side of that Deal's page.