It’s difficult to be specific, as I don’t know what you want to achieve, but here’s an overview…
The green boxes on the left are Blynk write event nodes. One (the “Family” app) is connected to one Auth code, the ‘Admin’ app to another. These are triggered when the widget attached to pin V1 (in either version of the app) is pressed.
Despite the apps being different, they both have a pin V1, and it performs the same function for both users. (In fact, the pins could have totally different numbers in the two apps, as they are both connected to different Auth codes, but you’d be making your life much more difficult that way.
The ‘Admin’ app has more controls, one of which is connected to pin V100 and this does some “special stuff” that is only available to the Admin user.
The outputs to the board are on the right hand side and these are blynk-ws-out-write nodes.
What you do in the middle will depend on you. They could be straight forward pass-through connections, or you could put some of your logic in the flow.
Data from the device can be passed to the app(s) in a similar way.