Open the loot_tables folder in the plugin directory. Make a new file called
Edit the file with your favorite text editor (preferably not notepad).
Here are some samples of what you could put in the file:
apples: id: 260 chance: .5 rolls: 4 amount: 3 a_sword: id: 267 chance: .3 rolls: 1
In game, target a chest and type
/cr set loot_table somename.yml.
This will tell the chest to restock with: 1-4 apples 1 iron sword