Help identifying components in schematic for HT9032
The open circle is an unlabeled terminal for the input voltage. The input should be at least the output rating (5V) plus (per the  HT1050 data sheet) the 300mv dropout voltage. Call the input range 6v to 12v to be safe. 

The symbol (mis)labeled 9V is a polarized capacitor. Again, per the HT1050 data sheet, 10uf @16v should be fine.

The ground symbol you show is usually used to designate a frame or chassis ground. In this case you can probably treat it as a standard common ground.