Packages are the little bits of text tied to a brand and price point. 6pk Bottles, 18pk Cans, etc.
Tagify starts you off with a bunch, but you'll almost certainly want to add more.
Adding
First, visit your package list by going to Packages from the menu up top.
Click New Package and punch in your package name.
Editing
Find your package in the list and click it. From here, you can rename your package.
Removing
Like brands, packages are crucial to your data and Tagify takes precaution to avoid accidental removal. If you need to remove one (perhaps because of a misspelling) you can always edit a current package and rename it.