Array property indexing and update

I have an array from selectable editable grid . Now i want to update value in the array under a particular property and then save that to the db. For saving to the database I am using writeToDataStoreEntity but i need to update some text and then submit for database save. Here is record from a selected row in the grid.

[acctType:(Investment-IRA) Prevailing Rate ,ppiStatus:Open,modifiedDate:4/11/2018 7:59 PM GMT+00:00,modifiedBy:steve.busser,createdDate:4/11/2018 7:59 PM GMT+00:00,createdBy:steve.busser,deadline:4/18/2018 12:00 AM GMT+00:00,ticketNumber:31,ppId:78]

I am trying to change ppiStatus to "Void", modifiedBy currentuser so on and so forth for the remaining fields.

Thanks

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