Hi @Anonymous,
You can can use the Display mode property of the Submit button to do what you require. If DataCardValue2, 6 and 9 were required, then the formula would be
If(IsBlank(DataCardValue2) || IsBlank(DataCardValue6) || IsBlank(DataCardValue9), Disabled, Edit)
Then unless there was data in those three controls, the user could not successfully activate the Submit button.
As an alternative, you could also hide the Submit button by putting a similar formula into its OnVisible property. In this case, all three values would have to hold data for the formula to reduce to true and Unhide the button.
!IsBlank(DataCardValue2) && !IsBlank(DataCardValue6) && !IsBlank(DataCardValue9)
If this answers your question, please mark the thread as solved.