Steps to Update the Delivery Service.

Go to the Delivery Service List by clicking Delivery Service tab from tab bar .
This open up a list of registerd payment type and you can update the selected Delivery Service by pressing Update tab.

After pressing Update tab the Payment Type update form opens up with the information of that registered payment type. User can change the various information according to the users requirements of that registered Payment Type.

Note: Changing or filling up information in Delivery Service update form is similar to that of Delivery Service registration process.
By entering the required field you simply can Click the Update button . By this process/ procedure you can perform simple update of a Delivery Service in the POS system.
Reason's why can't you Update Delivery Service
'Delivery Service' might be for multiple shop and you are a "Shop Manager". A Shop Manager is unable to delete or Update data for other shops.
A Shop General can only see Delivery Service, it cannot change or insert Delivery Service.
Delivery Service might have been used already used for order.