There are just few steps for you to edit an item's modifier of your items or options
Step 1
Login to your Yamimeal Merchent Portal via https://merchant.yamimeal.com/web/merch/#/login
Step 2
Click on "Menu" -> "Item"
Step 3
Click on the item's name into the "Item Detail"
Step 4
1. Click on "X" to delete your item modifier
2. Add your item modifier by clicking "add" on modifier
Submit to add modifier.
Step 5
Click "Submit" to save and publish your updated modifier
View video below for demonstrations of the procedures above.