I would probably configure a WAB and add the Edit Widget for this, but here goes the Pro way:
In this case I have a featureclass calle "myPoints" and a table calle "myTable" connected together with a relationship class (1:M). Both tables are visualized. I start an edit session, select a feature and activate the table of the points (in the lower section of the screen):
From the Ribbon I activate the Table View ribbon and select Related Data and the related table "RC_pnt2tbl: myTable":
Selection is propagated to the related table and I can new records:
I can activate the Edit Menu and store my edits:
And when I identify the point it will show this: