'Issue with DATEADD function in DAX

I recently started learning DAX. I am unable to understand DATEADD function properly. The below expression is giving error.

DATEADD(FIRSTNONBLANK(DATATABLE("TodaysDate",DATETIME,{{"9/24/2016"}}),TRUE()),4,MONTH)

A table expression containing more than one column was specified in the call to function 'DATEADD'. This is not supported.

But it's working with EDATE

EDATE(FIRSTNONBLANK(DATATABLE("TodaysDate",DATETIME,{{"9/24/2016"}}),TRUE()),4)

and FIRSTDATE is not working like FIRSTNONBLANK. Is there a problem with DATATABLE usage?

FIRSTDATE(DATATABLE("Today1",DATETIME,{{"9/24/2016"}}))

A table expression containing more than one column was specified in the call to function 'FIRSTDATE'. This is not supported.

Sources

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