Edit an Existing Task Flow

Hello all, I am new to HR and I think this might be very simple but I can't seem to be able to make any quick progress.

We have about 4 Custom Functions that in turn access 4 Custom Task Flows.

The object of the Task Flows is to restrict access to main HR Person form (PERWSHRG).

The Task Flow I need to edit is very basic it only has access to the first screen (Names, Employee Id etc) plus the button for Telephone contacts

I need to give it limited Access to the Assignments zone.

Based on the other 4 Task Flows, I need to add another row to the Nodes. That row, in our Setup is probably called NASSIGN