Assign task to user from Combo box

I´m really new to Outsystems and i´m trying to do  a basic application just like the ToDo Tutorial, what i need to do is to Create an Activity and select an User from a Combo box so only that user can see the activity in the main screen.

Hi Felipe,

are you still having difficulties getting started? If so, can you provide more context to what you're trying to do and where you're stuck?

Hi Jorge,
I already resolved the issue, but thanks anyway for taking your time to answer.