I have "Start Custom Task Process Action" and in task form fields I have a people picker. After task completed, I want to get selected user from people picker and use this value to send mail to this person.
How to achieve this? Thanks.
In the When Task Completes step, you can add a Send an Email action.
Click these users.
In the To field, click the address book and select Workflow Lookup for a User
Data source: Current Task
Field from source: your task form field