Record actions

Hello NeilTheodus,

You will have to create a process model to make changes in the existing data using a form with the approve and reject buttons containing the values add approve and reject respectively. You can configure the related record action manually in the record actions settings in the record type object. You will have to call your process model.

Hope this will help you!

The best way is to do via Record actions - https://docs.appian.com/suite/help/22.1/record-actions.html
or
You can add a button on your summary page and start a process when the user clicks on it using a!startProcess smart service inside button's saveInto.