Explanation
Graphical user interface, text, application Description automatically generated

Box 1: Name_DataCardValue1.Default
Box 2: Move the icon to the Activity form and set the On Select property to the Activity screen.
The Select function simulates a select action on a control as if the user had clicked or tapped the control. As a result, the OnSelect formula on the target control is evaluated.
Reference:
https://docs.microsoft.com/en-us/powerapps/maker/canvas-apps/functions/function-select