How to add a modifiers?

1. Open the "ManageApp".
2. From the navigation menu (three lines) on top left, select "Online Menu".
3. Click on the group (ex, Salad), Select Item
4. Click on "Setting icon" on top right, Select edit.
5. Scroll down and Click on "Options/Add-ons"
6. 
7. Type category/modifier name (ex. Choose toppings) under"Category name" section. (Check No.1 in screen below)
8. Click on "+" icon and add options and its prices.  (Check No.2 in screen below)
9. Choose required/optional and provide maximum and minimum numbers. (Check No.3 in screen below)
10. 
11. Click on "Back button" at the top left
12. Click Save.