There seems to be no way to "associate" or "find" a created Data Screen. I go through the process of creating a new data screen, a message at the top says "data screen saved". But there is no way to now "find" that new data screen. There is no way to list created Data Screens. There is no way to "name" data screens.
If I go to the selection for what my screen looks like (number of fields and layout) and I select it, the Data Screen I just created is NEVER there. The screen TYPE (7-A,B) layout is correct, but the data fields comprising that screen are default fields, not the ones I selected for it.
Attempting this a dozen times, there were times when my created Data Screen *was* present and associated with the Activity Profile. But when I go all the way back out to MENU and pull up that Activity profile again, the screen layout is correct, but the data fields are back to default ones.
Youtube is of no help.