Mutations(Update and Delete) - GraphiQL

I am new to Neo4j and GraphiQl and this is my first post in StackOverflow. I would like to please have some suggestions regarding this issue.

ISSUE:

I am trying to build a schema for Neo4j for the already existing model and also the mutations with the help of GraphiQL. Now am able to create nodes and add properties using GraphiQL, but not able to do an update and delete.

Sorry, couldn't post actual data. Can explain with an example.

Example:

Endpoint:graphql/idl

type Michigan
Troy:String
Lansing:String
Novi: String

type Illinois
Aurora:String
Naperville: String
Chicago:String


Once executed this query I am able to see the nodes in the browser.

Endpoint: Graphql/

Now in Graphiql mutations

mutation

#I can see createMichigan dropdown list here
CreateMichigan(City:"FarmingtonHills")




Able to add and can see the output in the browser.

Here I need to get a dropdown for the update and delete as well, which I am not able to.

Please do let me know where am I going wrong.

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