A standard servo female connector has ground (-), power (+), and signal, in that order. I've used Arduino boards that conveniently had a row of header pins for the I/O (signal) and then a parallel row of header pins for +5V and a parallel row of header pins for ground. Thus one could easily plug in a standard servo and begin programming.
The A-Star appears to be capable of the same thing -- almost. By soldering on the appropriate header pins one can obtain a row for I/O signal, a parallel row for "something" and a parallel row for ground.
The A-Star schematic and continuity tests suggest the "something" row is not connected to anything. I suspect this is intentional so that servos can be powered from a different supply if desired.
That said, if I have 5V capable servos, I believe I can jumper some 5V location on the A-Star to a "something" row to achieve what I'd like ... simply plugging in a servo connector to the board. Is this description/assertion correct?
Also, I am powering the A-Star from the USB connector via a power bank. The schematic and the pinout diagram suggest I want to jumper the via labeled "5V" next to the Pololu symbol to the "something" row to achieve what I'd like. Is this correct?